452 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 18, 



like or very similar characters through a thickness of above 100 feet, 

 I began to suspect that it was a mass of London Clay; and the 

 examination of the remaining specimens strengthened that convic- 

 tion. There were, it is true, no fossils (tbat, however, often happens 

 in borings of the London Clay in the London district itself) ; but the 

 characters of the beds were so uniform and so closely resembled the 

 ordinary London Clay, and the small calcareous and phosphatic 

 nodular concretions were so identical with specimens common in the 

 London Clay of Essex and Kent, — and the whole is underlain by a 

 seam of septaria, so usual in the Essex wells, — and these by a series 

 of beds of green sand and clay with lignite, so characteristic of the 

 beds between the London Clay and the Chalk (although they here 

 present a modified type), that I have not the slightest doubt of this 

 being a mass of true Lower Eocene strata in situ. 



Such a circumstance renders it probable that a bed of variable 

 thickness of London Clay may extend beneath the Crag between 

 Orford and Yarmouth, and may possibly range as far north as Mun- 

 desley or B acton. 



This mass cannot extend far inland, as the Chalk comes at places 

 to or near the surface along a line about ten to fifteen miles distant 

 from the coast. Erom this line, as the Chalk dips eastward, the 

 Eocene strata may probably set in, and, dipping also eastward, pass 

 out under the bed of the adjacent German Ocean. 



3. On some Eossil Foraminifera from Chellaston near Derby. By 

 T. Rupert Jones, Esq., E.Gr.S., and W. Kitchen Parker, Esq., 

 Memb. Micr. Soc. 



[Plates XIX. XX.] 



Several months ago, some clays (probably of Upper Triassic age) 

 which had been brought to Messrs. Cubitt's Works from Chellaston, 

 three miles south of Derby, were submitted to examination, and 

 yielded some unexpected results, affording us a fine series of Fora- 

 minifera. The clays examined were red and blue in colour, and were 

 obtained from the pits in which the alabaster occurs. The blue clay 

 yielded abundance of Foraminifera ; the red was barren. 



About a pound of the blue clay was washed down. It yielded a 

 considerable residuum (somewhat under ten per cent.) of fine sand, 

 chiefly siliceous and subangular, together with some minute pyritic 

 globules. There were two or three Otolites met with, some valves 

 of Entomostraca (a species of Cythere), and several fragments of Ecld- 

 nodermata (minute plates and spines). 



Of the Foraminifera, nearly one half consists of a variety of Rotalia 

 repanda (B. elegans, PI. XX. fig. 46). The individuals are very 

 small, and are similar to those found living in the Mediterranean, 

 in different places, at about 700 fathoms depth. Indeed it is a variety 

 very common in warm seas, and ranges from 100 to 2000 fathoms. It 

 is theBotalia Partschiana of D'Orb. (For.Eoss.Vienn. pi. 8. figs. 1-3), 



