506 



THE GEOLOGIST. 



Wenlock Limestone. 



Wenlock Limestone. 



13. Oinphyma Murchisonii. 



14. Aveolites Grayii. 



15. Cystiphyllum sp. 



16. Calymeua Blumenbachii. 



17. Athyris tumida. 



18. Rhynchonella splierica. 



19. „ nucula. 



20. „ borealis. 



21. Atrypa marginalis. 



22. „ reticularis. 



23. Strophomena depresssa. 



24. Euompholus rugosus. 



25. „ discors. 



26. „ sculptus. 



27. Euompholus funatus. 



28. „ carinatus. 



29. Encrinital stems. 



30. Calymena tubeiculosa. 



31. Lingula. 



32. Orthis hybrida. 



33. „ biloba. 



34. „ elegautula. 



35. Ehynchonella sp. 



36. Leptena transversalis. 



37. Acroculia? 



Wenlock Shale. 



Crustacea are rare at Coalbrookdale, when compared with the same formation 

 at Dudley. 



Abstract of paper " On the Inferior Oolite." By the Rev. S. H. Cooke, M.A. 

 The Inferior Oolite, as developed on the Cotteswolds, near Cheltenham, con- 

 sists of four chief divisions. 



1. Ammonite Sands, about forty feet thick, transitional between Upper Lias 

 and Inferior Oolite is the character of its organic remains, some being peculiar 

 to it, as Rhynchonella cynocephalus, well seen at Erocester and Haresfield Hills. 



2. Pea-grit, or Pisolite, forty feet thick, confined to the immediate neigh- 

 bourhood of Cheltenham ; pisolitic in structure, with many fossils, some pecu- 

 liar to it. 



3. Ereestone and Oolitic Pearl series, about a hundred and ninety feet thick 

 Leckhamptou Hill ; the freestone much quarried for building, but generally 

 unfossiliferous ; the Oolite-marl-bed, about seven feet thick, produces many 

 fossils, which are very constant ; near Stroud it contains a thin coral reef, 

 with Nerintea* 



4. B.agstone, about thirty-eight feet thick ; a hard gritty rock, with many 

 fossils (Gryp/uea Buckmannii, also found in the Swiss Jura and Swalica; and 

 Rhynchonella spinosa are peculiar to this division). It keeps a nearly constant 

 thickness over the whole district, while all the inferior divisions, along with 

 the Upper Lias, thin out, and finally disappear towards the east and south-east. 

 Thus at Stonesfield the ragstone is thirty feet; resting on Upper Lias six 

 feet, and that on Marlstone twenty-five feet. 



Inferior Oolite is also developed near Dundry, where the chief fossilife] 

 bed probably corresponds in place with the Cheltenham Pisolite ; also in Dor- 

 setshire, near Bridport, where it forms the coast section, but is much disturbed 

 by faults. Its fauna in these more southern localities differs much from the 

 Cotteswoldian, the Bristol coal-field having formed a complete barrier between 

 them. It is also largely developed on the Yorkshire coast, about Scarbov 

 where it reaches the thickness of seven hundred feet, and produces thin beds 

 of coal, with many ferns and plants. Here, too, its upper beds extend quite 

 up to the Cornbrash, the Great Oolite and Forest Marble being absent. 



Berwickshire and Tyneside Naturalists' Field Clubs. 



On the 24th ofAugusi there was a joint meeting of the Berwickshire and 

 Tyneside Naturalists' Club at Alnwick. The geological party went to Eat- 

 cheugh, under the able guidance of Mr. George Tate of Alnwick. The great 



