part 4] 



JURASSIC CHEONOLOGY. 



385 



The general features of the strata of this cliff will be discussed 

 in a later paper. Now the Junction-Bed claims attention. 



Diagrams. — Watton Cliff.near Bridport (Dorset), view of 

 Junction-Bed (Watton Bed) in face, looking northwards. 



1. 



2. 



4. 



Bluish sandy clay, with hard beds 

 at intervals. Basal Bridport 

 Sands or Down - Cliff Clay 

 equivalent. 



Junction-Bed. 

 block. 



Hard compact 



Yellow sands of Middle Lias, 

 faced on a very steep batter by 

 an irony conglomerate-bed, con- 

 taining belemnites (slickensided), 

 ammonites (Dumortieria, and 

 some Whitbian species). Some 

 20 feet of fault-face visible. 



Blue Clay. Under about a foot 

 of clay is Day's margaritatus- 

 bed — a bluish marly stone : 

 fallen blocks may be seen under 

 the cliff on the left. 



Diagram 4. 



Difference 

 in colour 

 between 

 Beds 1 & 3 

 very noticeable 

 in the cliff- 

 face. 



Watton Cliff, 

 near Bridport : view of 

 fault, looking- westwards 



Bluish sandy 

 clay, with hard 

 layers at intervals 

 (Basal Bridport Sands 

 or Down CUf( Clay 

 equivalent) 



Junction-Bed, 

 about S feet 



Yellow Sands 



of the 

 Middle Lias 



Foundered Block 

 of Junction-Bed 



