Outline of the geology of the neighbourhood of Cheltenham / By Roderick Impey Murchison.

  • Roderick Murchison, 1st Baronet
Date:
1834
Catalogue details

Licence: Public Domain Mark

Credit: Outline of the geology of the neighbourhood of Cheltenham / By Roderick Impey Murchison. Source: Wellcome Collection.

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    ■with a few feet of yellowish sandy loam, con¬ taining some spheroidal concretions of hard cal¬ careous grit, called by the workmen men’s heads. These nodules resemble those which mark the lines of stratification in the Inferior Oolite in the coast cliffs near Bridport, Dorsetshire; and which I have described as occupying the same geological horizon in the Hebrides.1 In this place they mark the former existence of a cover of the Inferior Oolite, which has been worn away. Be¬ neath this sandy loam, the quarries in work, 1S31, exhibited the following beds of the Marlstone of the Lias. 1. Lightish yellow micaceous sandstone full of Belemnites, 4 ft. 2. Pot -ears. Bluish gray calcareous grit, quarried for troughs, 1 ft. 6 in. 3. Pendle. Brownish hard calc grit, full of joints and fissures, 10 in. Wayboard of clay, with some fossils, 3 in. 4. Leathering-bed. Thick bedded very hard mi¬ caceous marlstone, of greenish brown colour, charged with fossils, of which Pecten equi- valvis and Belemnites abbreviatus are the most abundant, 5 ft. 5. Best double Blue. Hardest and best road- stone, weathers to a brown colour, 1 ft. 3 in. 6. Lowest Blue. A blue limestone, or highly cal¬ careous grit, partially discoloured by the de¬ composition of pyrites, 1 ft. 5 in. 1 Transactions of the Geolog. Soc. New Series, Yol. II. p. 353.
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