. Geology of parts of Wiltshire and Gloucestershire, (sheet 34). p; grande. Lye. & Hirsonensis. Lye. & MorCucuUaea Goldfussii. Roem. „ concinna. Goldfussii. Roemer.„ costata. Park.„ subglobosa. Lye. & ambigua. Sow. „ MurebisonijE. Sow. „ donacina. Lycett. Ceromya similis. Mor. & quadrata, Lye. & Mor.,, lurida. Sow. Combrash.—This formation, marked g^, is remarkably con-stant in mineral character and in the specific identity of its fossilremains. Although but a thin stratum, varying from 5 to 20 feet,it is one of the most persi
. Geology of parts of Wiltshire and Gloucestershire, (sheet 34). p; grande. Lye. & Hirsonensis. Lye. & MorCucuUaea Goldfussii. Roem. „ concinna. Goldfussii. Roemer.„ costata. Park.„ subglobosa. Lye. & ambigua. Sow. „ MurebisonijE. Sow. „ donacina. Lycett. Ceromya similis. Mor. & quadrata, Lye. & Mor.,, lurida. Sow. Combrash.—This formation, marked g^, is remarkably con-stant in mineral character and in the specific identity of its fossilremains. Although but a thin stratum, varying from 5 to 20 feet,it is one of the most persistent of all the members of the greatOolite. It may be described as a rubbly limestone, of a creamcolour when near the surface, but bluish beyond the influence ofthe atmosphere, as may be seen in the qiiarries near Rod-borne, south of Malmesbury. In some places it contains bands ofmarl and clay, as at Biddestone, near Corsham, where there aretwo distinct rock beds, separated by an intercalated bed of clay. B 18 CORNBRASH. No. Section in road East of Mahnesbury. a Oxford Clay. Dark blue clay. h Kelloway Rock. Brown sands and calcareous grUs, 2 ft. c Cornbrash. Blueish thin-bedded fossiliferous limestone, 6 ft. d Forest Marble. Clays and sandy shales. The Coi-nbrasli is throughout rich in fossils, which aregenerally well preserved, and have evidently been entombed inthe bed of a tranquil sea. Sections may be observed in the railway cuttings at Corsham,and in a quarry 100 yards north of the Bath turnpike road,three miles from Chippenham, where I found a specimen ofPygader Morrisii. Quarries and road sections occur atMalmesbury, and particularly at Charlton. There is *a roadsection at Pool Keynes, and quarries by the Ermine Road,south of Cirencester, and another by the Lechlade Road, onthe east side of Fairford. Ttpical Fossils feom the Coenbrash, g^. Ammonites macrocephalus. Schloth.„ discus. Sow. Nautilus lineatus. gregaria. Sow. „ acuminata.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgeology, bookyear1858
