PERRINITES (CEPHALOPODA, AMMONOIDEA) IN THE LOWER PERMIAN OF CALIFORNIA EDWARD C. WILSON Natural History Museum of Los Angeles County, Los Angeles, California 90007 A SPECIMEN of the ammonoid Perrinites Bose, 1919, was collected from the McCloud Lime- stone east of the summit of Tombstone Mountain, Shasta County, California. This is the first record of the genus in California, an important addition to the meager Permian cephalopod fauna of the state previously re- ported by Miller, Furnish, and Clark (1957) and Wilson (1984). It was found 1,100 feet (335 m) above the base of the formation in a coarse-grained limestone (Los Angeles County Museum of Natural History, Inver- tebrate Paleontology Section locality 6184) within fusulinid zone H of Skinner and Wilde (1965), considered to be late early or early middle Leonardian in age. The specimen was broken before burial but about half the shell remains, having a di- ameter of 36 mm and showing external char- acters and sutures (Figure 1). No transverse constrictions are present. Septal bases pre- served in the umbilicus indicate that at least one additional whorl is missing. The subdis- coidal, narrowly umbilicate, smooth shell and the highly digitate suture identify it as a Per- rinites and the suture configuration as P. hilli (Smith, 1903), recently revised by Tharalson (1984), who cited occurrences in Oklahoma, Texas, Mexico, and Guatemala. The speci- men was examined by W. M. Furnish, Uni- versity of Iowa, who reported (personal com- mun.) that it was closest to specimens of the species from the Cathedral Mountain For- mation of Texas and that an age designation of Late Leonardian "is fairly secure." This is slightly younger than the age obtained from fusulinids. I am grateful to Professor Furnish for his assistance. REFERENCES BOSE, EMIL. 1919. The Permo-Carboniferous ammonoids of the Glass Mountains, West Tex- FIGURE 1—Perrinites hilli Smith, 1903, from the McCloud Limestone, LACMIP hypotype 7181. 1, 2, lateral and dorsal views, x 1; 3, suture dia- gram, x3.5. as, and their stratigraphical significance. Texas University Bulletin, 1762:1-241. MILLER, A. K., W. M. FURNISH AND D. S. CLARK. 1957. Permian ammonoids from western United States. Journal of Paleontology, 31: 1057- 1068. SKINNER, J. W. AND G. L. WILDE. 1965. Permian biostratigraphy and fusulinid faunas of the Shas- ta Lake area, northern California. University of Kansas Paleontological Contributions, Proto- zoa, 6:1-98. SMITH, J. P. 1903. The Carboniferous ammo- noids of America. U.S. Geological Survey Monograph 42:1-211. THARALSON, D. B. 1984. Revision of the Early Permian ammonoid family Perrinitidae. Jour- nal of Paleontology, 58(3):804-833. WILSON, E. C. 1984. The goniatite Agathiceras (Mollusca: Cephalopoda) in the Lower Permian (Wolfcampian) of California. Journal of Paleon- tology, 58(l):277-278. MANUSCRIPT RECEIVED 26 NOVEMBER 1984 REVISED MANUSCRIPT RECEIVED 28 JANUARY 1985 JOURNAL OF PALEONTOLOGY, V. 60, NO. 5, SEPTEMBER 1986 0022-3360/86/0060-1133$01.00 Copyright © 1986, The Paleontological Society 1133
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PERRINITES (CEPHALOPODA, AMMONOIDEA) IN THE LOWER PERMIAN OF CALIFORNIA
EDWARD C. WILSON Natural History Museum of Los Angeles County, Los Angeles, California 90007
A SPECIMEN of the ammonoid Perrinites Bose, 1919, was collected from the McCloud Lime-stone east of the summit of Tombstone Mountain, Shasta County, California. This is the first record of the genus in California, an important addition to the meager Permian cephalopod fauna of the state previously re-ported by Miller, Furnish, and Clark (1957) and Wilson (1984). It was found 1,100 feet (335 m) above the base of the formation in a coarse-grained limestone (Los Angeles County Museum of Natural History, Inver-tebrate Paleontology Section locality 6184) within fusulinid zone H of Skinner and Wilde (1965), considered to be late early or early middle Leonardian in age.
The specimen was broken before burial but about half the shell remains, having a di-ameter of 36 mm and showing external char-acters and sutures (Figure 1). No transverse constrictions are present. Septal bases pre-served in the umbilicus indicate that at least one additional whorl is missing. The subdis-coidal, narrowly umbilicate, smooth shell and the highly digitate suture identify it as a Per-rinites and the suture configuration as P. hilli (Smith, 1903), recently revised by Tharalson (1984), who cited occurrences in Oklahoma, Texas, Mexico, and Guatemala. The speci-men was examined by W. M. Furnish, Uni-versity of Iowa, who reported (personal com-mun.) that it was closest to specimens of the species from the Cathedral Mountain For-mation of Texas and that an age designation of Late Leonardian "is fairly secure." This is slightly younger than the age obtained from fusulinids.
I am grateful to Professor Furnish for his assistance.
REFERENCES BOSE, EMIL. 1 9 1 9 . The Permo-Carboniferous
ammonoids of the Glass Mountains, West Tex-
FIGURE 1—Perrinites hilli Smith, 1 9 0 3 , from the McCloud Limestone, LACMIP hypotype 7181. 1, 2, lateral and dorsal views, x 1; 3, suture dia-gram, x3.5.
as, and their stratigraphical significance. Texas University Bulletin, 1762:1-241.
MILLER, A . K . , W . M . FURNISH AND D . S . CLARK. 1957. Permian ammonoids from western United States. Journal of Paleontology, 31: 1057-1068.
SKINNER, J . W . AND G . L. WILDE. 1 9 6 5 . Permian biostratigraphy and fusulinid faunas of the Shas-ta Lake area, northern California. University of Kansas Paleontological Contributions, Proto-z o a , 6 : 1 - 9 8 .
SMITH, J . P . 1 9 0 3 . The Carboniferous ammo-noids of America. U.S. Geological Survey Monograph 4 2 : 1 - 2 1 1 .
THARALSON, D. B. 1984. Revision of the Early Permian ammonoid family Perrinitidae. Jour-nal of Paleontology, 58(3):804-833.
WILSON, E. C. 1984. The goniatite Agathiceras (Mollusca: Cephalopoda) in the Lower Permian (Wolfcampian) of California. Journal of Paleon-tology, 58(l):277-278.
MANUSCRIPT RECEIVED 2 6 NOVEMBER 1 9 8 4 REVISED MANUSCRIPT RECEIVED 2 8 JANUARY 1 9 8 5
JOURNAL OF PALEONTOLOGY, V. 6 0 , NO. 5 , SEPTEMBER 1 9 8 6 0 0 2 2 - 3 3 6 0 / 8 6 / 0 0 6 0 - 1 1 3 3 $ 0 1 . 0 0
Copyright © 1986, The Paleontological Society 1133
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