By S. Coleman, J. B. Hartle, T. Piran, S. Weinberg
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Sample text
The a t t i t u d e of t h e c r o s s - b e d d i n g i n d i c a t e s t h a t t h e c u r r e n t flowed t o t h e w e s t . The c h a n n e l i s b e l i e v e d t o have been formed by a d e l t a d i s t r i b u t a r y t h a t flowed t h r o u g h a low-lying c o a s t a l marsh. The c h a n n e l i s o v e r l a i n by s i l t s t o n e a n d , of p a r t i c u l a r i n t e r e s t , by l e n t i c u l a r b e d s of l i m e s t o n e . This s t r a t i g r a p h i c succession suggests t h a t t h e d e p o s i t i o n a l environment may h a v e b e e n s i m i l a r t o t h a t s e e n t o d a y i n p a r t s of F l o r i d a , as d e s c r i b e d by Spackman, S c h o l l , and T a f t (1964).
T h e Graham Formation of t h e Upper Pennsylvanian Cisco Group i n t h e Brazos Basin, Texas, have been d e s c r i b e d i n d e t a i l by Lee (1938). The r e l a t i o n s h i p s of i n d i v i d u a l , superimposed channels i s i l l u s t r a t e d i n F i g . 1-20 which shows o v e r l y i n g channels c u t t i n g i n t o t h o s e below. and d e p t h s up t o 60 m. well-sorted, I n d i v i d u a l channels have w i d t h s of up t o 15 km The s a n d s t o n e s f i l l i n g t h e s e channels a r e q u a r t z o s e , cross-bedded, and l o c a l l y c o n t a i n abundant fragments of carbonized p l a n t remains.
A.. \I . OF ' W Y O M I N G LOWER TYLER DISTRIBUTION F i g . 1-30. D i s t r i b u t i o n of channel s a n d s t o n e members i n t h e lower u n i t of t h e Lower P e n n s y l v a n i a n T y l e r Formation, Montana. K r a n z l e r , 1966). (After 51 t r e n d i n g f o r more t h a n 500 km e a s t w a r d a c r o s s c e n t r a l Xontana i n t o North Dakota. T h i s v a l l e y c u t s i n t o l i m e s t o n e and s h a l e members of t h e :+ississ- i p p i a n Heath Formation ( F i g .