By Kennedy W.J., Cobban W.A.
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Extra info for Aspects of ammonite biology, biogeography and biosratigraphy
We figure here some of the more perfect examples known to us (Pis. 10-11), and would also point to the following examples, readily available in the Treatise (Arkell et al. 1957), among a host of others: 1. Ptychites (Anisian to Ladinian ceratitid) and Neoptychites (Turonian acantho ceratid). 2. Balatonites (Anisian ceratitid), Tropiceltites (Carnian tropitid), Arietites (Sinemurian psiloceratid), and Mortoniceras (Albian acanthoceratid). 3. Discotropites (Carnian tropitid), Grammoceras (Toarcian hildoceratid), and Neoharpoceras (Albian acanthoceratid).
Post-mortem distribution, which may be: (a) Minimal, in which case the occurrence closely reflects the original life distribution. (b) Extensive, the resulting post-mortem drift producing a distribution pattern far wider than in life, as in Recent Nautilus. (c) Tectonic separation or juxtaposition of regions as a result of plate motions. Much information on ammonite distributions has been published in three recent compilations: Faunal Provinces in Space and Time (Middlemiss and Rawson 1971), the Atlas of Palaeobiogeography (Hallam 19736, specifically Cariou 1973; Enay 1973; Dietl 1973; Howarth 1973a; Kummel 1973; Matsumoto 1973; and Wiedmann 50 AMMONITE ECOLOGY 1973a-6), and The Boreal Lower Cretaceous (Casey and Rawson 1973).
La-b, 10 the c o s t a t e var. regularis H a a s a n d la-b, the typical form. F r o m the m i d - T u r o n i a n Carlile S h a l e o f the B l a c k Hills at U S G S M e s o z o i c locality 2 1 7 9 2 . F i g s . 3 , Oxytropidoceras (Manuaniceras) hubbardi K n e t c h e l , U S N M 2 6 1 0 6 5 , f r o m the m i d - A l b i a n o f P e r u a n d 4, Discotropites sandlingensis H a u e r , U S N M 7 4 0 0 9 , f r o m the late Triassic H o s s e l k u s L i m e s t o n e , S h a s t a C o u n t y , California.