. Geology of parts of Wiltshire and Gloucestershire, (sheet 34). irencester. Thus wehave the clays of one district occupying the position of oolite inanother, and vice versd. Some of the bluish flagstones of the Forest marble present acurious collection of fragmentary fossils, in which we find shellsof Mollusca, plates and spines of Echini, stems of Pentacrini,and fragments of plants strewn over the surface of the of this kind will be found in the quarries at BickersBarn and West Yatton near Corsham, the Folly north ofTetbury, in the quarries around Shipton Moyne, at DudleyHouse ne
. Geology of parts of Wiltshire and Gloucestershire, (sheet 34). irencester. Thus wehave the clays of one district occupying the position of oolite inanother, and vice versd. Some of the bluish flagstones of the Forest marble present acurious collection of fragmentary fossils, in which we find shellsof Mollusca, plates and spines of Echini, stems of Pentacrini,and fragments of plants strewn over the surface of the of this kind will be found in the quarries at BickersBarn and West Yatton near Corsham, the Folly north ofTetbury, in the quarries around Shipton Moyne, at DudleyHouse near Amney, and in quarries at Barnsley. The finestsections of this formation are exhibited in the railway cuttingsat Corsham and Kemble. In the neighbourhood of Tetbury and Cirencester, we findbeds of yellow siliceous sand, containing large blocks of chert, ahard siliceous limestone which, on being split, seldom showsthe concretionary structure. These masses may be seen in aquarry near Sandy Lane, south of Cirencester, of which thefollowinof is a sketch. No. Forest Marble near Cirencester. a ? Slaty, false-bedded oolite, with oysters. b Soft yellow sands, with large blocks of chert. This bed of sand occurs also at Chavenage Green, north ofBeverstone, and at Hillsome near Tetbury. The entire thick- 16 FOREST MARBLE, ness of the Forest marble around Tetbury is about 60 feet,which becomes diminished to more than one half towards thenorth-east extremity of the district. Fossils form the Geeat Oolite and Fokest Marble, 9?, 9^. orbulites. Lam. Isastrea explanulata. McCoy. Cladophyllia Babeana. DOrb. „ limitata. Lam. Cyathophora Prattii. M. Edw. Microsolena excelsa. M. Edw. Eunomia radiata. Lam. Thamnastrea concinna. Goldf. Wrightii. Nucleolites orbicularis. Acrosalenia hemicidaroides. Wright. soludurinus. Ag. „ spinosa. Ag. ^^ sinuatus. Aust. Nucleolites clunicularis. Llhwyd. maxillata. Sow. Rhynconella farcta
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgeology, bookyear1858
