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Extra resources for Advances in Jurassic Research 2000. Proceedings of the Fifth International Symposium on the Jurassic System. R.L. Hall and P.L. Smith (Eds.), GeoResearch Forum 6
A Phanerozoic time scale. Episodes 1 9/1 -2:3-5. __ __ __ __ __ __ __ __ Figure 4. Comparison areas. PALTECHIOCERAS SP. :1· ::; j� PALTECHKXERAS SP. I :: PAAASTEROCERAS SP. G') Q) 0 � � a :J- cil 2 3 PALAEOECHIOCERAS SP. + OXYNOOCEAAS SP. � =- 0) A. VAAIANS A. AFF. MARGARITA + EPOPHIOCEMS SP. + A. AFF. JELETZKYI + ? A. CF. SALTFUENSE + AFINIOCERAS SP. +A. AS A. RETUSUM A . SP. AFF. MAAGAFIT I A + ARNIOCERAS SP. ASTEROCERAS SP. , HIU£BPANOT 1987 ARNIOCERAS SP. f :A. P. �=A ASTEAOCERAS ? SP. A f ......
L. SMITH AND H. W. TIPPER. 1 994. Sinemurian (Lower Jurassic) ammonoid biostratigraphy of the Queen Charlotte Islands, Western Canada. Geobios, Memoir special, 1 7:3 85-393. PALMER, C. P. 1 972. The Lower Lias (Lower Jurassic) between Watchet and Lilstock in North Somerset (United Kingdom). Newsletters on Stratigraphy, 2 : 1 -30. REMANE, J. 1 996. The revised Guidelines of iCS and their bearing on Jurassic chronostratigraphy. GeoResearch Forum, 1 -2 : 1 9-22. -- -- -- __ __ __ __ __ _, 22 Sh Jurassic Symposium, Vancouver SPATH, L.
The specimens differ from the type specimen in having a somewhat wider umbilicus. This species is typical of the horizon with S. depressa in southwest Germany and differs from · S. depressa only in having a narrow umbilicus (see Lange, 1 925, pi. 1 8, Fig. I ). On the upper surface of Bed 1 34, large specimens of Schlotheirnia, badly worn by the sea and occurring irt isolated groups, are usually not extractable. It is not yet certain, therefore, if S. depressa is present in Somerset. Immediately above Bed 1 34, Schlotheirnia pseudornoreana Spath appears and persists to the top of the Hettangian in Bed 145 (C 1 00, 60cm above limestone Bed 1 44) (PI.