Page 1 of 1 - Ohio State University libraries pt3.pdf · 2007-04-10 · -ISXIVERSAFLY ADDRESS BY PRESIDEAT lxvii PUBLICATIONS OF THE SOUTHERN RHODESIAN GEOLOGICAL SURVEY Bulletins

From Susan Karber~ <[email protected]>

Sent Saturday, April 7, 2007 5:37 pm To dittoe. [email protected]

Cc

BCC

Subject looking for a source

Dearest Pattie,

Can I please ask a big favor? I need an article that my library does not have. I looked it up in OSCAR and you have it! woo hoo!

Do you have time to scan this and send it to me ASAP? or have one of the students do it Monday or Tuesday? I 'm distributing my thesis proposal to my committee on Wednesday and this source should be very helpful!

Here is the source: MCGREGOR, A. M. 1951. Some milestones in the Precambrian of Southern Rhodesia. Transactions of the Geological Society of South Africa, v. 54 (I'm not sure what pages)

AND the call number: Q E l G344305 (v.54 1951)

Thanks so much!! Susie

Susan Karberg [email protected] Graduate Teaching Assistant Department of Geological Sciences University of Minnesota, Duluth Heller Hall 202 218-260-8167

Page 1 of 1

k

l x ~ i PROCGEDISGR O F THE GEOLOGICAL SOCIETY O F S O C T H AFRICA

_&HREXS, I,. H. aiid GORFIXKEL, L. G. (1950) : ii'ature, Lond. 166, p. 149. ASDREK, A. R. and BAILEY, T. E. G. (1910) : " The geology of Xyasalaad." Quart.

Journ. geol. Soe., LXVI, pp. 197-198. BA~SISTER and HORHE (1950) : " A Radioactive mineral from 310zambique related to

davidite. JIiner. Mag. Lond., XXIX, pp. 101-112. C'OOKE, H. B. S. (1950) : " The ancient geography of South - a k a . " S.A. Geog. Journal:

00 3'5.

DIXEY, F. (1928) : Annua l Report, Geological S u w e y Department, i iyasaland Proteeto~ate. ESKOLA, P. (1949) : " Mantled gneiss domes." Quart. J . geol. Soc., Lond. CIV, pp.

461-476. GROUT, F. (1935) : " The compositions of some African granitoid rocks. Journal of

Geology, XLIII, p. 289. GUERNSEY, T. D. (1940) : " Geology of the concession areas of The Loangwa Concession.

Cnpublished, seen by courtesy of the Resident Director, British South Africa Company.

GCERXSEY, T. D. (1940) : Provisional outline of the Geological features of Northern Rhodesias. Report to B.S.A. Co.

EESS, H. H. (1951) : " Vertical mineral variation in the Great Dyke of Southern Rhodesia." Trans . geol. Soc. S . Bfr. LIII, pp. 159-168.

HOL~ES, A. (1919) : " The Pre-Cambrian and associated rocks of the district of Aiozambique." Quart. J . geol. Soc., LXXIV, pp. 31-96.

Z O L ~ ~ E S , -1. (1920) : " The Nomenclature of Petrology," Murby, London. H o ~ n i ~ s , A. (1948) : Trans . Ed in . geol. Soc., XIV, p. 176. HOL~IES, A. (19.50) : " The age of urani~lite from Gordonia, South ,Ifi.ica." Amer. J .

Sci., CC XLTTIII, pp. 81-94. - - HOYLE, F. (1950) : " The Sature of the Universe," Black~vell, Oxford. LIGHTFOOT, B. (1941) : " The Great Dyke of Southern Rhodesia." Proc. geol. Spc. S .

.iI.fr., XLIII, pp. xxvii-xliii. ?~IAC!GREGOR, 9. $1. (1927) : " The probleizz of the pre-Calnbrial? -Itmosphere." S. A f r . J .

Sci., SXIV, pp. 155-172. STACGREGOR, ,I. 3PA(1929) : Guide Book, C 20. Intern. geol. Cong. Pretoria, pp. 35-36. XACGREGOR, A. M. (1932) : " Batholiths of Southern Rhodesia." Geol. i i a g . Lond.,

LSIX, pp. 18-29. XACGREGOR, A, M. (1940) : " -1 pre-Can~brian algal limestone in Southern Rhodesia."

Trans . geol. Soc. S. &*., XLIII, pp. 9-16. XACGREGOR, -1. M. (1946) : '' Sinlpsonite and other Tantalates from Bikita, 9outhern

Rhodesia." iifiner. J fag . Lond., XXVII, pp. 157-165. XACGREGOR, A. M. (1951) : " The primary source of Gold." S. A f r . J . Sci., Vol. 47,

Jan. 1951, pp. 157-161. XACGREGOR, A. &I. : " =I comparison of the geology of Korthern Rhodesia and Adjoining

Territories." Intern., geol. Cong. Lond., 1948. Pt. XIV in the press. SJCSAUGHTON, J. H. 31. : I n t e ~ n . geol. Cong. .Land., 1948. Pt. XIV ill the press. XENNELL. F. P. (1904) : '' Geology of Southern Rhodesia." Rhodesia iWuseum, Spe , iul

Report No. 2, Bulswayo. &TENISELL, F. P. (1920) : "Geology of the Sabi Valley, Washonaland." Trans. geol.

Soe. S. Afr. , XXII, pp. 68-89. SPENCER, E. (1938) : " The potash-soda felspars, 11. Some Applications to Petrogenesis."

-Iliner. Z a g . , XX'V', pp. 87-118. TEALE, E. 0. and ~VII,SON, R. C. (1915) : " Portuguese East Africa between the Zambezi

River and the Sabi River." Qeogr. Jour. Lond., XLV, pp. 16-45. TPSD.~LE-BISCOE, R. NcI. : " Sotes on a nlonzonitic complex and associated rocks in

the Gwanda District, Southern Rhodesia." Trans . geol. Soe. S . Afr. , XLI, pp. 83-102.

WAGNER, P. A. (1914) : " The Geology of a Portioii of the Belingwe District of Southern Rhodesia." Trans . geol. Soc. S. Afr. , XVII, pp. 39-54.

%-ILLEIVISE, J. (1938) : " On the Old Granite of the Vredefort region and some of its associated rocks." Trans . yeol. Soc. S. Afr. , XL, pp. 97-99.

-ISXIVERSAFLY ADDRESS BY PRESIDEAT lxvii

PUBLICATIONS OF THE SOUTHERN RHODESIAN GEOLOGICAL SURVEY

Bulletins

3. The Geology of the Selukwe 31ineral Belt. By H. B. Naufe (Director), B. Lightfoot and the late A. E. V. Zealley (Geologist's), 96 pp. 8vo, 14 plates. 1919. Reprinted 1924. Price 7s.

6. l'reliminary Report 011 the Geology of the Cou~lt~ry West of Sinoia, Loma,gundi District. (Out of print).

7. The Geology of the Enterprise Mineral Belt. By H. B. Maufe. 52 pp. Svo, 4 plates, map. 1920. Reprinted 1935. Price 2s. 9d.

9. The Geology of the Conntry West of Sinoia, Lomagundi District). (Out of priizt). 10. The Geology of the Country West of Mount Darwin. By B. Lightfoot and R.

Tyndale-Biscoe. 54 pp. Svo, 6 plates, 1 Fig., 1 Wa,p, 1931. Price 2s. 9d. 11. The Geology of the Country around Lonely Mine, B~ibi District. By A. 31-

Bfacgregor. 96 pp. Svo, 7 plates, 3 maps. 1928. Price 6s. 12. The Geology of the Shabani Mineral Belt, Beling-we District. By F. E. Keep*

185 pp. 8vo, 18 plates, 14 figs., map. 1929. Price 7s. 6d. 16. The Geology of the Chroivite and Asbestos Deposits of the Umvukwe Range, Lo i~~a-

gundi and Mazoe Districts. By F. E. Iieep. 105 pp. Svo, 13 plates, 3 sections. 1930. Price 4s.

17. The Geology of the Country between Gatooma and Battlefields. By A. AT. Macgregor. 144 pp. Svo, 13 plates, S figs, map. 1930. Price 4s. 9d.

IS. The Geology of the Couiitry around Shamva, Mazoe District. By 12. Tyndale- Biscoe. 87 pp. Svo, 11 plates, 6 figs, map. 1931. Price 3s. 9d.

19. Interim Report on the Geology of part of the Sa,lisbury Gold Belt. (Out of print). 20. The Geology of the Country around Que Que, Gwelo District. By A. M. Macgregor.

113 pp. 8v0, 13 plates, map. 1932. Price 2s. 6d. 21. The Geology of the Antelope Gold Belt. By A. E. Phaup. 119 pp. 8v0, 5 plates,

map. 1932. Price 3s. 3d. 22. The Geology of the Central Part of the 3Iazoe Valley Gold Belt. By R. Tyndale-

Biscoe. 108 pp. Svo, 13 plates, map. 1933. Price 3s. 9d. 24. The Geology of the Lower Gwanda Gold Belt. By 9. E. Phaup. 74 pp. Svo, 3

plates, map. 1933. Price 2s. Bd. 27. The Geology of the Cou~t'ry around Filabusi, hnsiza District. By J. C. Ferguson.

1.79 pp. Svo, 20 plates, map. 1934. Price 5s. 20. Chemical Analyses of the Rocks, Ores and iXinera.1~ of Souther11 Rhodesia. By

E. Golding (cornpilati011 and descriptions by 9. E. Phanp). 105 pp. 8vo. 1938 (Out of print).

30. The Geology of t'he Count'ry around the Queen's Xine, Bulawayo District. By A. 31. Macgregor, J. C. Ferguson and F. L. A m . 175 pp. Svo, 19 plates, 5 figs., map. 1937. Price 5s. 6d.

31. The Geology of the Country around Hunters Road, Gwelo District. By A. 21. Nacgregor. 78 pp. Svo, 8 plates, map. 1937. Price 2s. 3d.

33. The Geology of the Count,ry around the Junlbo >!tine, 3lazoe District. By J. C. Fergusoii and the late T. H. Wilson. 131 pp. Svo, 7 plates, map. 1937. Price 4s. 6d.

34. The Geology of the Lower Unifuli Gold Belt, Hartley and Lolnagundi Districts. By A. E. Phaup aizd F. 0. S. Dobell. 143 pp. Svo, 11 plates, map. 1938. Price 5s.

35. The Geology of the Country around Bulawayo. By F. L. Amm. 307 pp. 8 ~ 0 , 25 plates, 2 maps. 1940. Price 9s. 9d.

36. The Geology of the Country aaroand Gmanda. BY R. Tyndale-Biscoe. 204 PIJ. Svo, 14 plates, 14 figs., map. 1940. Price 6s. Gd.

37. The G;eology of the Lower Gwelo Gold Belt,. By L. dnlm. 73 Pp. plates¶ map. 1946. Price 3s. 3d.

38. dn oLtline of the Geological History of Southen1 Rhodesia. BY -4. 3%. Macgregor. 73 pp. 8vo. 1947. Price 2s.

39. ~h~ ~ ; ~ ~ l ~ ~ ~ of the ~oul l t ry around Gmelo. By R. Tylldale-Biscoe. 1980.

lxviii PROCEEDIKGS O F TEIE GEOLOGICAL SOCIETY O F SOGTIi AFRICA

Short Reports

10. The Geology of the Lonzagundi Mica Deposits. By B. B. 3Iaufe. 8 pp. Svo, 2 figs. 1920. Reprinted 1934. Price Bd.

25. The Geology of the Country around the Korah. Molly and Cnzboe Copper Claims. Lomagundi District. By A. M. Macgregor. 10 pp. Svo, 1 map, 1 fig. 1931. Price 9d.

34. Geology and Xines of the Mashaba District. Bv R. Tyndale-Biscoe. S pp. Svo, map. 1940. Price 6d.

35. ~ e o l o ~ y of the Mafungabusi Gold Belt. By A. &I. Xacgregox. 26 pp. 81-0. 2 plates, map. 1941. Price Is. 3d.

Annual Reports of Director

A.R.D. (1927 ), publishes 1928. A.R.D. 1949), published 1950.

TABLE I.

GEOLOGICAL FORMATIOKS AKD EVEKTS.

1 AGE IN 1 iVIILLIOPIT 1 YEARS I (Al~rens) ' and others.

UPPER PRECAMBRIAN. Erosion and Faulting Zambezi Metamorphism and

Granite Intrusion Intrusion of Great Dyke aiid

folding LOMAGUNDI SYSTEN, sedimentary.

Unconformity DETVERAS SYSTEXI, volcanic and

sedimentary Great unconformity

MIDDLE PRECAMBRIAN FROXTIER SYSTEM, sedimentary

Great Unconformity

ARCHAEAX Potash-Adan~ellite. relative age

not known E Younger granite D &Iatopo granite C Younger gneiss B

SHAMVAIAN SYSTEM, nlaj nlv sedi- mentary Unconformity Younger gneiss in part (?)

BULATVAYAN SYSTEM, mainly volcanic Unconformity Older gneiss A

SEBAKTVIAN SYSTEM, sedimentary and volcanic, with intrusive Magnesian Series

Muscovite. S-Cu-Au. IT.

CBronle ore. Pt.

Li etc. Minor 8-Au. Ta-Li-Be-Sn. 2Iajor S-An.

Chrome ore I

-1SNIVERSARP ADDRESS BY PRESIDEKT lxix

SCBEDULE OF ANALYZED GRANITES.

SOUTHERN REGION. -4.-Olde~ Gneiss ?

Ko. 45. Qua~ter niile from south-west contact of Shabani Serpentiiie. Bull. 12.

B.-Younger Gneiss. No. 162. Slightly gneissic granite, I8 miles E.N.E. of Bulawayo. Bull. 35. Xo. 545. Fine massive granite, 9 miles E.S.E. of Turk Mine. Bull. 30. No. 587. Gneissic granite near Lumani Siding. Bull. 36. No. 585. Porphyritic gneiss N.E. of Gwanda. Bull. 36.

C.--1lutopo Granite. No. X. No. 539. No. 403.

D.- Younger No. 264. No. 267. No. 291. Xo. 586.

Matopo Rills. Grout (1935). Quarry 2 miles N.W. of centre of Bulawayo. Bzcll. 35. Porphvritic granite, between two belts of schist. 24 miles S.E. of Antelope &'Ii<e. " ~ ~ 1 1 . ~ 2 4 . Formona granite 12 miles S.E. of Turk Mine. Bull. 20. Stock, Sally Mine, 2 miles S. of Colleen Bawn Mine, Gwanda. Bull. 36.

~Tfassive &unite. Five miles S.E. of Antelope Mine. Bull. 21. Ten miles S.8.E of Antelope Mine. Bull. 21. Gneissic granite 5 feet from contact 3.3 miles W. of Antelope Mine. Bull. 21. dplogranite, post-mineral dyke, 4 miles 9. of Colleen Bawn, Gmanda, Bull. 36.

CENTRAL REGIOX. -4.-Older (Rhodesdale) Gneiss.

No. 38. Gileissic granite, Inkernlan Mine, 19 miles S.S.W. of Gatooma. Bull 17. No. 218. Gneissic granite, Glenorchy Mine 8 miles S.S.E. of Gatooma, Bull. 17. No. 249. Gneissic granite 3 miles E. of Qne Que. Bull. 20. No. 251. Aplitic granite, Globe and Phoenix Mine, Que Que. Bull. 20. No. 259. Taba Mali Mine, Que Que. Bull. 20. Xo. 648. Xont d'Or aplitic granite, 6 miles S.S.E. of Selukwe.

B.-Younger Gneiss cincl Grey Tonalite. No. 217. Grey tonalite, 19 miles N.N.E. of Sebakwe-Umniati confluence. Bull. 17. No. 511. Grey tonalite. Zaloba Siding, 16 miles N. of Gwelo. Bull. 31. No. 540. Zwimba (Biri) granite, 3 miles N.E. of Biri-Umfuli confluence. Bull. 34. No. 595. Zwimba granite, 20 miles E. of Sinoia. Xo. 651. Gneissic granite, St. Anthony's Mission, 3 miles E. of Selous Siding. No. 652. Porphyritic granite, Selons Siding, I6 miles E.N.E. of Rartley. No. 660. Twenty miles E. of Sinoia. hTo. 661. Four miles S.E. of Sinoia.

NORTHERN REGION. A*--Olde~ Gneiss 3' Madziwa batholith.

No. 67. Eighteen miles N. of Bindura. No. 285. Mtupme Hill, 13 miles N. of Bindura. No. 500. Xtupwe Hill, 13 miles N. of Bindura.

8.-Younger Gneiss Stocks. Richer in potash than Madziwa granite.

No. 219. Borehole Hay Mine, Bii~dura Stock. Bull. 22. No. 232. Prince of Wales Mine, Bindura Stock. Bull. 22. So. 503. Prince of Wales Mine, Bindura Stock. B 199. Twelve miles E. of Salisbury. Chishawasha Stock,

Poorer in potash than Madziwa granite. No. 244. Cupola 6 miles east of Shamva Mine. Bull. 18. No. 243. Cupola 3 miles S. of Shamva Mine. Bull. IS. No. 487. Granite Farm Cupola 4 miles N. of Jumbo Nine. Btill. 33.

~ X X PROCEEDISGS O F THE GEOLOGICAL SOCIETY OF SOUTH AFRICA&

C.-Porphyritic (13fatopo) Grunite. No. 134. Cataclastic granite, 100 feet W. of contact of Great Dyke. BztZl. 16. No. 142. Pink porphyritic granite Marandellas, 40 miles S.E. of Salisbury. No. 590. Porphyritic gneissic granite Kenimore Farm N.E. of Sinoia. No. 596. Porphyritic granite, 26 miles N.E. of Sinoia. No. 654. Porphyritic hornblende-biotite granite, 50 miles W.S.Ti7. of Sinoia.

D.-nfassive Fine-Grainecl Granite. B 24. 32 miles W.K.W. of Bindura. B 25. 24 miles W.N.W. of Bindura.

23.-1Various Granites, Relations not knotfin. KO. 101. Called Chiweshe gneissic granite, 24 I d e s hy.S.M7. of Bindura. Bull. 10. No. 140. Potash-adamellite. Quarry 1 mile S. of Salisbury. XI. Potash-adamellite, 25 miles 8. of Salisbury. Xo. 237. Lime-tonalite, 25 miles S.E. of Salisb~u.;\-.

TABLE III. DETERAIIKATIONS OF THE AGE OF xIKE SPECI31EXS OF LEPIDOLITE FROM SOUTHERN RHODESIA BY L. H. AKREKS USING; THjE

RTJBIDIU?VI/STRONTPUM METHOD.

(3) Mauve Kop, AIdara Tantalu~n JEine. (dark purple niassive) . . 3,100 3,300 2,900 2,300

Mean 2,950 - - & 10:~;

(6) A1 Hayat Mine. If miles S.S.E. of Bidara Mine, (white, massive, with microlite) . . . . . . . . . . 3,000

2.250

Mean 2,450 f 10% - -

( 5 ) Bikita Quarry, S. of A1 Hayat Mine? 1 4 miles 8. of Mdara Mine (fine massive) . . . . . . . . . . . . 2,300

2,200 1,700 2,400 -

(7) Nigel Claims, 4 mile S. of Mdara Mine (purple: columnar) . . 2,100 2,100 2,000 2,200 1,800 -

Mean 2,050F 10% - -

AXSIVERSAXP ADDRESS BY PRESIDEST lxsi

lliillion yeccys. (9) Augustus Claims, 15 miles K.X.E. of Salisbilry (pale: com-

pact 1 . . . . . . * . a e . . . . 2.300

( I ) Pope Tantalum Mine, Chisawasha Farm. I1 miles E. of Salisbury (single large crystal, p~wple) . . . . . . 2,000

1,900 2.500 2,100 2.360

Mean 2.150' - 10% - ODZI GOLD BELT . e . . . . * . . s . . 2.000

(4 ) Duke's Hi!l Clain~s ((purple) . . . . . . . . . . 2,000 1,950 2,460 1.960

Mean 2 , 1 0 0 1 - lo?, - WANKIE TIPI' FIELD . . . . * . . . . . . . 2,050

(2) Lutope Tin Mine (pale mauve) * . . s . . . . 2,100 2,200 2,100 2,100 -

Mean 2 , 1 0 0 1 107; - - ANTELOPE GOLD MINE: 80 miles 8. of Bulavc~ayo . . e s . . 2,100

(8) $ mile E. of main shaft, on line of mine reef . - . . 1>900 1,750 1,900 1,700 -

Mean 1,900f 10% - P

c/o GEOLOGIC& SURVEY, P.O. Box 39, CavsEu;.ir. SALISBURY,

S. RHODESIA.

I x x ~ ~ PROCEEDIKGS O F THE GEOLOGICAL SOCIETY O F SOUTH L F R I C A

Dr. S. H. Haughton proposed a vote of thanks to the ret'iring President for his Addsess with these remarks :

Nr. President', ladies ancl gentlemen, Xembers of our Society resident in . the Union and South-MTest Africa should feel a sense of gratitude for the support

which Ive receive from our colleagnes who live and work outside our territorial boundaries, those colleagues who comprise a total of 93 out of our 375 ordinary members, or almost 30 per cent. Most partictilaj5y should we feel grateful when one of them, already a recipielzt of the Draper Menlorial Medal, should agree to undertake the onerous task of preparing a Presidential Address of the type to whic,h we have listened this evening. To be able to add to our published work the fraits of Dr. 3Iacgregor's researches, makes us realise more fully that the words " South Africa " in the name of our Society mean something more than the political unit of the Union of South Africa, and that, as a Society, we have a membership that ranges over the whole continent, south of the Sahara, and even beyond the confines of Africa itself. As a Society we can make claims towards being international, just as our science itself is international.

111 his address this evening, our retiring President has dealt with his subject mainly as touching Southern Rhodesia ; but he has recognised that the problem of the sequence of events during the long period of Pre-Cambrian t,ime and the cognate one of the correlation of Pre-Cambrian rocks is one affecting the major part of our continent. To one like myself who has dabbled from tinie to time in the utilisation of fossils for strat'igraphic purposes, it is a regret that the Pre- Cambrian sedimeiits contain no reinains of living organisms that can be used for correlation ; for I do not believe that the Collm~ia and Collerzia-like structures of the calcareous members of the upper Pre-Cambrian sedinients are sufficiently diagnostic to be used for this purpose; We are forced, therefore, to attempt to use other crit'eria far obtaining relative ages and sequences in our endeavour to prepare a picture of the history of our area froin tbe earliest times to the advent of recognisable forms of life upon it.

Dr. Maegregor has tonight given us the outlines of this history as he sees it. The criteria he has considered from the view-poiut of their applicability to the problem are the classical ones of superposition of sedinlents and extrusive rocks, relationships between these and the intrusive rocks, .orogenic movements, and degree of metamorphism and the niore recently used one of assessing absolute age by measurements of radioactivity. He has issued a warning against too rigid an adherence to the tenets of uniformitarianism in studying the earth as it was two or more thousands of millions of years ago ; and he has suggested, as I see it, the e~ist~ence in those times of a cornparatirely thin crust resting uneasily upon a more mobile sub-crust which rose and fell unevenly, forming great domes between which the crustal rocks accommodated themselves by a,

process t'hat approximated to slumping. Progress in the unravelling of the complex history of the earth has been

made possible by the patient; collecting of facts into an accumulation of data, and the subsequent formulation of hypotheses desig~~ed to combine some or all of the data into a coherent and acceptable whole. Most of these attempts at synthesis deal each with a section of the known facts. Eac,ll hypothesis has t,o

be revised as new facts arise ; were i t not so, our science would becollie rigid and sterile and there would be no creed for us but firm orthodoxy. We ought, therefore, to be grateful to our retiring President for offering to us tonight something that combines statements of fact with novelty of ideas, and for contributing in a valuable manner to the solution of a problem that is of con- tinental imporatnce. I t is to be hoped that there may arise a conjoint edort by a number of geologists, pooling tlzeir local knowledge and their techniques and ideas, which will lead to a clearer understanding of the Pre-Cambrian of Africa than we a t present possess.

1 have much pleasure, ah. President, in proposing a vote of thanks t o Dr. Macgregor for his address, and I trust that it will be published in full.

Dr. L. T. Nel, in seconding the vote of thanks said :

31r. President, ladies and gentlemen, in supporting Dr. Haughton's vote of thanks I should like Dr. Macgregor to know that we are very pleased that he is here with US at the Annual General meeting, and that we consider it a privilege to have been able to listen to one who speaks with authority because of his know- ledge and experience of the subject cbosen by hini for his address. We realise, too, that we would have benefited greatly by his presence at the meetings of Council and the Ordinary General meetings, which however proved impossible, as his home i t so remote from this centre.

Dr. Macg~egor's address is a concise, up-to-date review of Rhodesian Pre- Cambrian geology, which should be of the greatest use to geologists not only of Rhodesia but also of neighboui-ing territories. His previous papers and reports, of which there are many, indicate that since he joined the Rhodesian Geological Survey, of which he subsequently became its Director, he has devoted much attention to the study of the Pre-Cambrian rocks of Southern Rhodesia.

In 1927, for example, after pointing out in his paper on (' The Problem of the Pre-Cambrian Atmosphere " that in the Pre-Gambrian sediments there is no evidence of contemporaneous oxidation that later sediments have undergone, he advanced the interesting idea that the Pre-Cambrian atmosphere was rich in carbon dioxide but lacked oxygen-an assumption that could explain the problems connected with the banded ironstones so characteristic of Pre-Cambrian rocks everywhere. His address is niade so stimulating by ideas such as these- explanations that have perhaps not occurred to many of us before. I noted with interest Dr. Macgregor's statement that there is little evidence of dynamic metamorphism in the Archaean formations of Southern Rhodesia and that minerals like kyanite, sillimanite, and staurolite are not recorded from them. Detailed mapping in the belt of country along the Orange river between Upington and the West Coast, has shown on the other hand that these minerals are all well developed in the strongly metaniorphosed Archaean rocks of that area, and that the structural patterr of the Archaean formations appears to be the result of ancient orogeny. Apparently therefore conditions in kchaean times must have varied froin place to place.

I mention this to indicate that the Pre-Cambrian formations, which occupy such wide tracts of country in southern Africa, constitute a common field of

~ X X ~ V PBOCEEDIKGS OF THE GEOLOGICAL SOCIETY O F SOVTH AFRICA

study and that kindred problems exist north and south of the Limpopo. Eecent detailed mapping of Pre-Cambrian formations, especially in northern and eastern Transvaal and in the north-western Cape, by the Geological Survey of the Union of South Africa provides evidence additional to that so ably collected bj- Dr. AIacgregor and his colleagues on the Geological Survey of Southern Rhodesia. The pooling of knowledge acquired by niembers of these two officiaa institutions, and that provided by other geologists i.11 these and neighbouring territories, must undoubtedly lead to a, better understanding of these ancient rocks.

I am sure we are unaninious that Dr. Maegregor has made a very valuable contribution to the knowledge of Pre-Cambrian rocks and have pleasure in seconding the vote of thanks.

Dr. Macgregor thanked Dr. Haughton and Dr. Kel for their kind remarks, and the members present for their appreciation of his Address.

PROCEEDIZGS 06.' TIIE GEOLOGICAL SOCIETY OF SOCTH AFRICA ~ S X V

Minutes of Ordinary General Meetings of the Society, held in the Main Hall, Kelvin House, 7 5 , Marshall Street, Johannesbnrg.

8th May, 1951, a t 8 p.m.

Mr. F. A. Venter, President, in the Chair. The Minutes of the Meeting held on the 12th December, 1950, TT-ere

confirmed. The following were elected Members of the Society : C. 0. Baker, E. A. L.

Gevaerts, and 8. S. J. Hiemstra. The following Student Nembers were elected Members of the Society :

A. Bernstein, 8. T. Dyjas, J. P. McMagh, N. Musgrave, I. T. Ralston, E. Shagam, W. Simpson, 0. J. van Straten and P. P. Venter.

The Chairman announced that It. A. Edge, R. D. Enzniann, H. H. Hahn, S. Levinkind, 8. J. Malherbe, J. A. Mills, R. J. Ortlepp, E. W. Redelinghuys? N. If. Taylor, J. F. Truswell, E. Ti. van Deventer, and J. J. Viljoen had been admitted as Student Members of the Society.

Through the courtesy of the Anglo-Anierican Corporation of South Africa the first part of the technical films dealing v-ith the copper industry of Northern Rhodesia were shown.

The following papers were presented : " A Volcanic TTent near Lambert's Bay, Cape Pro-rince," b~ F. Walker. '"he Geology of the Bikita Tin Fields,,' by R. Tyndale-Biscoe.

Coal ProVinces in the Natal Coalfields," by J. J. 6. Blignaut.

Notice was given that a Special General Meeting .cvould be called for the pur- pose of considering the Council's revised Constitution and By-Laws.

12th June, 1951, a t 8 p.m.

Mr. F. A. Venter, President, in the Chair.

The Minutes of the Meeting held on the 8th May, 1951, were confirmed.

The Chairman announced that M. J. Howard, E. L. Aiann, and M. I?. Ovenden had been admitted as Student Members of the Society.

Notice was given that a Special General Meeting would be called for the purpose of considering the Council's revised Constitution and By-Laws.

The remainder of the films dealing with the copper industry of Korthern Rhodesia were shown, through the courtesy of the Anglo-American Corporation of South Africa.

30th August, 1951, a t 8 p.m. Mr. F. A. Venter, President, in the Chair. The President announced with regret the death of Professor G. A. 11-ater-

meyer, a member of Council, and President of the Society for the year 1931.

2nd October, 1951, a t 8 p.m.

Mr. F. A. Venter, President, in the Chair. The Minutes of the Meeting held on the 11th Sept'ember, 1951, were con-

firmed. The following paper was presented :- " Some Results of Radiometric Logging in the Boreholes of the Orange

Free State Goldfields and Neighbouring Areas," by D. J. Simpson.

IXXT~ PROCEEDI~GS OF TEE GEOLOGICAL SOCIETY OF SOUTH AFRICA

T]le sI\linutes of the Meeting held on the 12th June, 1951, were confirmed. > ~ ~ ~ ~ ~ s , J. C. Boshoff, P. J. vaii Zijl, and A. S . Webb were elected Members

of the Society. The Chairnlan announced that 8. S. Amdvver liad been admitted as a Student

3Iei11ber of the Society. The following papers were presented :- ' $ The Geoinorphology of the Eastern and Southern Districts of Southern

Rhodesia," by L. C. King. " Cyclic Sedimentation in Varved Sediments of the Nailla System in South-

Tes t Africa," by R. Kora and H. Nartin. " Structure and Metamorphism in the Ohimanii~laiii 310untains9 Southern

Rhodesia," by Geoffrey Bond. " The Seismicity of South-MTest Africa," by H. Korn and H. Martin. " The Manganese Ores of Otjosondu, South-West Africa," by J. E. de

TTillier s .

11th September, 1951, at 8 p.m.

BIr. F. A. Venter, President, in the Chair. The President announced, with regret, the death of AIr. John V. AIulIer,

Xeniber of the Society since 1935. The Ninutes of the Meeting held on the 30th August, 1951, were confirmed. The Chairman announced that J. F. Lambert had been admitted as a Student

3Iexzzber of the Society. Dr. S. 6. Davis, of the Hong Kong University, gave a lecture oil '"he

scope of Mining for Afinerals in Rong Rong in particular, and South China in General."

Xr. A. Frost proposed a vote of thanks to ,Dr. Davis for his interesting lecture.

PROCEEDIXGS O F THE GEOLOGICAL SOCIETY O F SOUTH AFRICA lxxvii

Minutes of a Special General Meeting of Members, held in the Main

Hall, Kelvin House, 75, Marshall Street, Johannesburg, on the. 2nd October, 1951, a t 9.10 p.m.

Mr. F. A. Trenter, President, in the Chair.

The President' declared the meehing duly constituted.

The notice convening the nieeting, which was for the purpose of considering and, if approved, adopting with or without amendment, the revised Constitution and By-Laws, Memorials and Awards of the Soeiet'y, as recon~mended by hhe Council, copies of which had been circulated to all members, was t>aken as read.

The following a!mendments were niacle to the revised Const,itution and By- Laws, Memorials and Awards :-

Clau,se 3.03 : The words '( and from the retiring " to be subst'it'nted for t'he word " the " in t,he second line.

Clause 3.07 : The words '( for the previous year " t o be added a t the end of the first paragraph ; the word " list " t o be inserted between (' ballot ' j and " shall " in the first. line of the second paragraph.

Clause 5.04 : The words " and Proceedings " t'o be inserted after " T~ansact ions " in the penultimate line.

Clause 5.11 : The words (' or extracts from them " to be inserted aftfter " papers " in the third line.

Clause 7.09 : A new cJause 7-09 to be inserted, this clause to read as f o l l o ~ ~ s .-

List of Recipients. The list of recipients shall be kept and published in tbe

Proceedifiys.

Clause 5.02 : This clause to read :- Constitwtion of Wtudents' Prizes The Students7 Prizes and Corstorphine Medal Comrnit,tee

shall consist of three members and shall he appointed bg the and Corstorphine C,ouncil a t the April Council &Ieet,ing in each year. Nedal Committee

Clauses 8.02 These clauses, as drafted by t'he Council, to be renumbered to 8.11 : 8.03 to 8.12.

Clause 9.05 : The words Geographical Society South Bfric,a " in the seconcl line to read South African Geographical Society.':

On the proposal of the President, seconded by Mr. J. H. Taylor, i t 13-as resolved that :-

1. The Constitution and By-Laws, Memorials and Awards, as revised by the Council and amended a t this meeting, be adopted ;

lsxviii PROCEEDIXGS O F THE GEOLOGICAL SOCIETY O F SOUTH AFRICA

2. That Tuesday, 1st January, 1952, hereinafter called the Transfer Date, shall be t8he time fixecl for the introduction of the revised Constitution and Bg-Laws, Slen~orials and Awards, hereinafter called the Revised Constitution ;

3. That after the Transfer Date, the affairs of the Society shall be governed by the provisioils of the Revised Collstitution which shall supersede the Con- stitution aild Rules a t present in force, and hereinafter called the Old Con- stitution ;

-I. That these resolutioils are made to facilitate the change-over from the Old Constitution to the Revised Constitution and shall be enforced for that purpose only. The decision of the Council oil any matter incidental to the chaage-over and not provided for in these resolutions nor in either the Revised Constitution or the Old Constitution shall be final and binding 011 all members.

Minutes of a Joint General Meeting with the South African Association for the Advancement of Science and the South African Geographical Society, held in the Main Hall, Kelvin House, 75, Marshall Street, Johannesburg, on the 25th October, 1951, a t 8.15 p.m.

Prof. R. A. Dart, '\Tice-Presidei~t of the Solltli African Association for the Advancement of Science a-as in the Chair.

The Second Alex. L. du Toit Xeniorial Lecture was delivered by Prof. H. H. Read, Professor of Geology a t the Imperial College of Science and Technology, London, and was entitled " Xetaniorphisin and Granitisation."

Dr. S. H. Haughton, President of the South -4frican Geographical Society proposed a vote of thanks to Prof. Read, which was seconded by Mr. I?. A. Tenter, President of the Geological Society of South Africa.