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The Lower Marine Molasse, which comprises t h e middle Oligocene tonmergel and p a r a l i c s a n d s t o n e w i t h i t s minor i n f l u x of conglomerate ( T r b p y , 1960; FUchtbauer, 1964), f i l l e d t h e f o r e d e e p e a r l y i n mid-Oligocene t i m e ; s e v e r a l hundred metres were d e p o s i t e d a t t h e narrower w e s t e r n end and o v e r a lOOOm i n t h e wider e a s t e r n end where s u b s i d e n c e was more a c t i v e (FUchtbauer, 1964). The s u c c e e d i n g p a r a l i c s a n d s t o n e s show s i m i l a r t h i c k n e s s v a r i a t i o n s r a n g i n g from a few t e n s o f metres i n t h e west t o s e v e r a l hundred metres t h i c k i n t h e e a s t .

16);. A l l u v i a l f a c i e s have been a c c u m u l a t i n g i n t h e s e b a s i n s s i n c e Miocene times and t h e o l d e r d e p o s i t s a l o n g t h e n o r t h e r n margin of t h e a l l u v i a l a p r o n a r e f o l d e d and t h r u s t e d s o t h a t t h e d e p o s i t i o n a l a x i s of t h e b a s i n has m i g r a t e d p r o g r e s s i v e l y southwards w i t h t i m e . Block diagram i l l u s t r a t i n g o r i g i n o f t h e Ridge Basin a t a curve i n San Andreas F a u l t ( a f t e r C r o w e l l , 1974b).

1 6 ) . These b a s i n s a r e p r i m a r i l y p a r a l l e l t o t h e main t e c t o n i c t r e n d a s a r e t h e main d r a i n a g e c o u r s e s , a l t h o u g h t h e r e a r e a l s o t r a n s v e r s e elements ( F i g . 16);. A l l u v i a l f a c i e s have been a c c u m u l a t i n g i n t h e s e b a s i n s s i n c e Miocene times and t h e o l d e r d e p o s i t s a l o n g t h e n o r t h e r n margin of t h e a l l u v i a l a p r o n a r e f o l d e d and t h r u s t e d s o t h a t t h e d e p o s i t i o n a l a x i s of t h e b a s i n has m i g r a t e d p r o g r e s s i v e l y southwards w i t h t i m e .

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