FROM THE OOLITIC STRATA. 



11 



The Middle Coral-bed is included in the Oolite-marl, and in some localities, as at 

 Frith, Leckhampton, Sheepscombe, and others, it contains masses of corals. 



The Upper Coral-reef occupies the horizon of the Upper Trigonia Grit, and is very well 

 exposed in many sections. That of Cleeve Hill has yielded the best corals. The following 

 section is open near Frith. Ascending the bank above this quarry for a short distance 

 some fields or arable land are passed over, on which are several heaps of the Upper 

 Ragstones, with Trigonia cost at a, Gryphaa subloba, and other shells of the higher zone. 

 Walking in the direction of the Grove, after passing over the summit of the hill and 

 descending a short distance, a good section of the upper reef may be seen in the Slad 

 Valley. 



Section of the Quarry at Worgin's Corner, Tipper Zone of Inferior Oolite} 

 Lithology. Beds. 



Masses of Coralline Limestone, 

 4 feet thick. 



Hard shelly Limestone, full of 

 the shells of Brachiopoda, 

 5 feet. 



Hard shelly sandy Oolite, full 

 of Gryphcea, 6 feet. 



Organic Remains. 



Upper Coral-reef. 



Terebratula-globata 



Bed. 



Gryph-Ea Bed. 



Thamnastrcea, Isasircea, The- 

 cosmilia, Magnotia Forbesi, 

 Stom ech in us intermedius, 

 Pecten, Trigonia costata. 



Terebratula globata, Rhyncho- 

 nella spinosa, Pholadotnya 

 fidicula, P. Heraulti, Ostrcea, 

 Gervillia, Trichites. 



Gryphaa subloba, Lima pro- 

 boscidea. 



The remarkable varieties of Thecosmilia gregaria, which resemble the genus SymphyUia 



and Heterogyra, are found principally in the lower reef, but they exist in the upper also. 



Some species appear to be peculiar to the different reefs, but it is unsafe to form lists at 



present. There is evidently a considerable affinity between the faunas of the reefs, and 



there is nothing to indicate anything more than a temporary absence from and a return 



of the species to an area. 



1 See Dr. Wright's pamphlet, from which the whole of this description is abstracted. 



