44 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



[Apr. 6, 



Terebratula globata, Sow. Clypeus Plotii, Klein. 



Kbynckonella spiuosa, Schloth. Hugii, Ag. 



Pedina rotata, Wright. Anabacia orbulites, Lamour. 

 Stomechinus intermedius, Aq. Cladophyllia, sp. n. 

 Echinobrissus clunicularis, Lhwyd. Isastrsea tenuistriata, Edw. 8f Haime. 

 Holectypus depressus, Lamk. Thecosmilia gregaria, Edw. Sf Haime. 

 hemisphaericus, Des. 



In the Stroud district, the zone of Ammonites ParJcinsoni is well 

 developed, and in some places richly fossiliferous. Among these 

 localities, Painswick Hill, Rodborough Hill, Selsey Hill, Scar Hill, 

 and Culver Hill near Nailsworth, may be enumerated as affording 

 good sections. 



The Parkinsoni-zone or ragstone, at Painswick Hill, according to 

 Mr. Hull, " is well developed, becomes very sandy towards the base, 

 and contains a bed of siliceous sand of considerable thickness. The 

 beds are very fossiliferous, containing Gryphcea, Trigonia, Lima, and 

 Modiola. The whole thickness of the zone cannot be less than forty- 

 five feet." 



Section V. — Rodborough Hill. 



Although the beds composing the zone of Ammonites ParJcinsoni 

 have not the same thickness here as in the Cheltenham district, still 

 their subdivisions may be readily distinguished, whilst many of the 

 Conchifera are far superior in conservation to those found in the 

 northern Cotteswolds. The rock having long been raised for road- 

 material and boundary-walls, a considerable surface has in conse- 

 quence been exposed. The beds are all extremely fossiliferous ; and 

 the shells, when it is possible to extract them from the hard matrix, 

 are well preserved, although they are rarely got out entire. 



ft. in. 



A. Upper Trigonia-grit. — A hard, light- coloured sandy 



limestone, composed of several beds. There are 

 two or more fossiliferous bands in the bed, crowded 

 with Conchifera. The shells are in the condition of 

 crystallized carbonate of lime, or represented by 

 internal moulds 8 



B. Gryphite-grit. — A greyish or brownish concretionary, 



siliceo-calcareous rock, filled with the valves of Gry- 

 phaza sublobata and a few other species of Conchifera. 

 From 1 foot to 2 6 



C. The Lower Trigonia-grit. — A hard greyish or brownish 



argillaceous limestone, crowded with the shells of 

 Conchifera heaped together in all directions. The 

 bed is in fact in great part composed of the valves 

 of many species of Mollusca, and rests on a thick - 

 bedded oolitic freestone, bored by Annelida 1 



The above note having been made some years ago, I intended to 

 have verified it now ; but as I felt unequal at present to climb Rod- 

 borough Hill, I requested my esteemed friend, Dr. John Lycett, to 

 examine the section for me ; and he reports — 



