CLAPP AND SHIMER: SUTTON JURASSIC. 
427 
organisms, that is, they are typical calcarenites. Interstratified with 
the calcarenites are layers, one very thick, composed chiefly of pelecy- 
pod shells, which form a veritable coquina. 
Although it is probable that in all of the limestone lenses, fossils 
were originally very abundant, in the great majority of cases at the 
present time all traces of the original organisms have been destroyed. 
Even in the known fossil-bearing beds, the limestone has been re- 
coral beds Ond 
COfumo. hcc/s. 
Text-fig. 2. — Sketch map of southern Vancouver showing location of the fossil- 
bearing beds of the Sutton formation. 
crystallized into a fine-grained to compact marble, and on the fresh 
fracture only, traces of the very abundant fossils can be detected. 
As the fossils have not been silicified, or even converted to dolomite, 
it is only very rarely that they have been weathered out so as to be 
identifiable. At the locality where the determinable fossils have 
been collected the beds are covered by the lake during seasons of 
