268 M"R. E. WITCHELL ON THE BASEMENT-BEDS 



The following sections will show the general character of the 

 5ds: — 



Section at GricJcley Hill taJcen at the Western end of the Quarry. 



(1) Pea Grit. 



ft. in. 



1. Brown pisolite 4 



2. Brown pisolite 3 



' 3. Brown pisolite, thickness variable, about 5 



' 4. Coarse oolite subdivided by pisolite 7 



6. Brown coarse pisolite 5 



6. Pisolite beds 11 



(2) Lower Limestone. 



Four beds of oolitic limestone composed of shelly- 

 detritus, fragments of spines of Echinida, and 



oolitic granules 8 6 



Fine-grained oolitic limestone 1 9 



Coarse-grained oolitic limestone 6 



Coarse brownish oolitic limestone 2 6 



Hard brown compact oolite 5 



(3) Sandy Limestone. 

 15.1 



ifi I 



1 2" j- Four beds of ferruginous sandy limestone 6 3 



ISj 



(4) Cephalopoda-bed, not exposed. 



In this section it will be seen that the Pea Grit and pisolitic beds 

 are 35 feet thick, and the limestone beds 22 feet 9 inches and 6 feet 

 3 inches. The beds 7-10 are persistent over the Stroud area, and 

 are almost identical in structure with the Crystalline Oolite at 

 Frocester Hill. 



General Section at Buscomhe near Stroud. 



ft. in. 



1. Freestone 10 



2. Pisolite 3 



3. Pisolite, pisolites detached 3 



4. Freestone with reddish-brown sand in the partings... 10 



5. Oolitic limestone, a very thick bed, hard and semi- 



crystalline in the upper part, mainly composed of 

 shelly detritus, fragments of coral, spines, &c. 

 Upper surface level, covered with small valves of 

 Osifrea and marks of boring 16 



6. Three brown sandy limestone beds 9 



7. Cephalopoda-bed 



The thick bed (No. 5) may be seen in Standish Park, on the north- 

 western slope of the hill, also in Horns Yalley, near Stroud, 4 miles 

 distant. 



