270 Prof. Morris — Boring Mollusca in Oolites. 



Marly bed at base, about one metre. 



In a quarry at Fresnay -la-Mere is the following section l : — 



Caen limestone, with Bhynchonella spinosa, two metres. 



Limestone, bard and a little siliceous, very fossiliferous, upper 

 part with Pecten corneus, lower part with Ammonites ParTcinsoni, A. 

 Niortensis, Ter. sphceroidalis, Ter. Phillipsii, Ancyloceras annulatus, 

 upper surface worn and perforated, one metre. 



Yellowish limestone (sometimes sandy) with Pholadomya fidicula, 

 Ter. perovalis, upper surface worn and perforated, 60 centimetres. 



Yellow clay, no fossils, 10 centimetres. 



Marly limestone, many fossils, Pecten mquivalvis, 20 centimetres. 



Yellowish, marly, sandy limestone, Bel. niger, Pecten cequivalvis, 

 Bhynchonella tetrahedra, Terebratula punctata, 1-| metres. 



Conglomerate more or less sandy, 2 metres. 



Yellowish clay, with pebbles, half-metre. 



Palasozoic rocks, much eroded. 



The Inferior Oolite also presents evidences of lithophagous per- 

 forations. Mr. Hull states, that the beds which rest immediately on 

 the Pea-grit are generally sandy and ferruginous. They are fre- 

 quently pierced by Lithodomus attenuatus (Lycett), and are filled 

 with spines and plates of Echini, Corals, and Pentacrinite stems. 

 The beds above these and below the Oolite Marl are considered 

 most valuable as a building material. They present obliquely 

 laminated structure very frequently, remarkable examples of which 

 are exhibited in one of the quarries at the north side of the Cleeve 

 Cloud, and at Frocester Hill. 2 



At Cleeve Cloud the Eagstone (Upper Inferior Oolite) contains 

 a bed of yellow siliceous sand at or near the base, which may also be 

 observed in a quarry near the Tower, at Broadway Hill. 



Mr. Lycett mentions that at Scar Hill, near Nailsworth, below the 

 Upper Eagstones there is a bed of compact oolite, bored everywhere 

 by small vertical tubes of marine annelid a. 3 



Sir H. de la Beche, 4 in describing the district around Whatley, 

 Nunney and the Vallis Vale, states, " Not only is a large portion of 

 the area, wherein the Inferior Oolite is seen to rest on the Carboni- 

 ferous limestones, observed to have presented a marked even surface, 

 viewed on the large scale, for the deposit of the former, but, through- 

 out, this surface has been drilled into holes by lithodomous animals, 

 which must have existed in the seas at the commencement of the 

 Inferior Oolite. The holes which were observed by Professor John 

 Phillips, in 1829, are of two kinds, one long, slender, and often 

 sinuous, extending several inches into the Carboniferous limestone, 

 the other entering that rock a short distance only. In the former we 

 find no traces of shells, in the latter we often discover them, in the 

 situations in which they lived. In both holes we find the matter of 

 the Inferior Oolite, which entered them from above at the time of its 



1 Deslongchamps, ibid. p. 19, pi. 2. 



2 Hull, Memoirs, p. 37. Hull, ibid. p. 45. 



3 Lycett, The Cotteswold Hills, p. 49. 



* Memoirs of the Geological Survey, 1846, vol. i. p. 289. 



