- An Introduction to Palaeontology [2 ed.] 9878187567936

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IN

T O

PA L A E O N TO L O G Y

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A N

IN T R O D U C T IO N

TO

T A L A E O N * TO L O G Y

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T H E W O R L D P R E S S P R IV A T E L IM IT E D 2 0 12 K O LK AIA * * *

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S T R A T TG R A P H IC P A LA E O N T O L O G Y

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O F F A U N A L S U C C E S S IO N

5 2 LAW

T H E B A S IC P R IN C IP L E O F S T R A T IG R A P H IC

PA L A EO N T O L O G Y In b io s t r a tig r a p h y fo s s ils i b o s tr a t ig r a p h ic s u b d iv is io n

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p r o p o s e d th e la w o f s u p e qp o s itio n w h ic h a s s u m e s th a t in a s e q u e n c e o f b e d s it u m e a s ily b e fo llo w e d th a t a r e la id d o w n o n th e to p o f o ld e r s tr a ta H e n c e o f th e s e q u e n c e w ith o ld e r fo s s ils s h o u ld b e fo u n d to w a r d s th e b o tto m yo u n ge r o

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p H o w e v e r th e fir s t c o n c lu s iv e s ta te m e n t in th is r e g a r d c a m e fr o m w illia m S m ith ( 17 6 9 1 8 3 9 ) w h o p r o p o s e d a n o th e r fu n d a m e n ta l p r in c ip le th e la w o f ja u n a l s u c c e s s io n a s s e m b la g e o f fo s s ils in a r o c k s e q u e n c e e x h ib it s s o m e c h a n e in a A c c o r d in g to th is la w g i l l i d k t s n o m e e e t s r r o f a c m s o r o m o r d e e r a n n n a m i y m o r p p l t c e c m a o m p e x ty p e to w a r d s s y s te t h e y o u n g e r r o c k s S o e a c h s e g m e n t o f t im e r e p r e s e n te d b y a b o d y o f r o c k a lw a y s s h o w s a d is tin c t iv e a s s e m b la g e o f fo s s ils w h ic h is d iffe r e n t fr o m th a t o f th e o v e r ly in g a n d u n d e r ly in g b e d s T h is p a tte r n o f fo s s ils in a r o c k s e q u e n c e h e lp s a s tr a tig r a p h e r to id e n tity r o c k h o d ie s s h o w in g id e n t ic a l fo s s ils e v e n lo c a te d a t w id e ly s e p a r a te d a r e a s a n d to a s s i n th e m to s a m e g h w I k r e a e r e a n a r c n o s a r e ro ld e d a n d d e fo r m e d o t ir p p lic a t io n o t lilw g e o lo g ic a l t im e d l iffi b d t t i u e i c e u o o c i l c m a a s i t o n o n s a o i r n v e rs o n o f b e d s s u pe p y F a u n a l s u c c e s s io n a in b e s a fe ly u s e d h e r e p r o v id e d t h e r o c k s c o n t a in fo s s ils F a u n a l s u c c e s s io n is c o n s id e r e d a s f l f l i l ty p e s o fu n d a m e n ta b a s s o a s tr a tig r a p h ic a p p lic a tio n o f f il S ith h o w e v e r f lile d to

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