Memoirs of the Geological Survey of Pakistan, Volumes 5-6The Survey, 1969 |
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Page 17
... ribs are very numerous , crowded anteriorly and in the middle region than posteriorly . The radial ribs are traversed anteriorly by broad markings and cross - bars . more This species is distinguished by its smooth , flat - topped radial ...
... ribs are very numerous , crowded anteriorly and in the middle region than posteriorly . The radial ribs are traversed anteriorly by broad markings and cross - bars . more This species is distinguished by its smooth , flat - topped radial ...
Page 16
... ribs about seventeen in number , comparatively thin in the umbonal area , gradually thicker and broadly convex towards margin except in the postero - dorsal region where they are almost straight ; broadly spaced ; the entire margin of ...
... ribs about seventeen in number , comparatively thin in the umbonal area , gradually thicker and broadly convex towards margin except in the postero - dorsal region where they are almost straight ; broadly spaced ; the entire margin of ...
Page 29
consists of prominent thick almost flat topped radial ribs , about one - and - half times broader than their intervals ; ribs are more pronounced in the ventral region producing crenulation on ventral margin , and obscure in the umbonal ...
consists of prominent thick almost flat topped radial ribs , about one - and - half times broader than their intervals ; ribs are more pronounced in the ventral region producing crenulation on ventral margin , and obscure in the umbonal ...
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Common terms and phrases
abapertural view aperture appears Arch Archiac & Haime band broadly Chharat consists convex Corbula Cossmann & Pissarro Cotter Cretaceous Description Deshayes designation differs dimensions District D. G. Khan Domanda shale dorsally Drazinda shale Drug section exterior left valve Family fauna feet figured Formation forms fossil Further distribution gastropod Genus Geol geology Ghazij fm gray Group height holotype India intervals Iqbal Italy Jhalar Kohat Lamarck larger length Limestone lines Linne Locality Lower Eocene margin Middle Eocene monotypy ornament Ostrea outline pakistanica Eames Paleocene Paris pelecypod PLATE pointed posterior preserved prominent Quetta Rakhi Nala Range Recent Remarks ribs right valve rounded Shahrig shell short similar slightly soriensis Eames specimen spiral Surv suture thick thin threads Type number.-Specimens type occurrence Type species UCLA umbonal Upper ventral Vredenburg West Pakistan whorls Zinda Pir section