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By U. Bayer, A. Seilacher
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Extra resources for Sedimentary and Evolutionary Cycles
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I 0 : l g l - 1 8 l . H a l l a m , A. 1977: B i o g e o g r a p h i c e v i d e n c e b e a r i n g on t h e c r e a t i o n o f t h e Atlantic seaways i n t h e 3 u r a s s i e . C. ~ P a l e o n t o l o gy and p l a t e t e c t o n i c s . M i l w a u k e e P u b l . Museum Spec. P u b l . , B i o l . G e o l . 2: 2 3 - 3 9 . --- 1978: E u s t a t i e c y c l e s P a l e o e c o l . 23: 1 - 3 2 . in the J u r a s s i c . - P a l e o g e o g r . , P a l e o e l i m a t o l . , P a l e o e c o l .
C. ( e d . ) : T r e a t i s e on I n v e r t e b r a t e P a l e o n t o l o g y . p t . L, Ammonoidea, 1 - 3 6 , 4 7 - 7 9 , f i g s . 1 - 3 7 , 4 6 - 1 2 3 , New York. S. 1982: The P h a n e r o z o i c Time S c a l e r e v i s i t e d . (3), 3-9, 5 figs. E. 1958: N a m y u r s k i y y a r u s v m i r o v o y s t r a t i g r a f i e h e s k o y s h k a l e . - B y u l l . mosk. obshchv, i s p y t , p r i r o d . , o t d . g e o l . , 1 t a b . , Moskva. E. F. 1971: N a m y u r s k l y e t a p v e v o l yutsii ammonoidey.
9 Myr; B: Visean (excl. 2 Myr; C: Namurian A and B (incl. up. 8 Myr; D: Namurian C - up. 7 Myr. 9 Myr in the Tournaisian (Fig. 8 Myr in the Namurian (Fig. 5C). 2 Myr in t h e Visean (Fig. 7 Myr in the Westphalian-Stephanian {Fig. 5D). Subdividing the g o n i a t i t e g e n e r a according to t h e i r a v e r a g e longevity into 3 c a t e - gories (1) short-lived (O-4 Myr} genera, (2) average ranging genera (4-12 Myr) and {3) long-lived (12-40 Myr) genera (text-fig. 6}, shows t h a t the first and third portions are c h a r a c t e r i z e d by the short-lived genera, w h e r e as t h e second and fourth portions contain the longer lived genera.