R. TATE ON THE LIAS ABOUT RADSTOCK. 503 



the A.-armatus region. The series under review cannot even be re- 

 garded as passage-beds, as they are called by Mr. C. Moore. No 

 traces of stratigraphical unconformity have, however, been noticed, 

 save those described in this communication. 



The strata intervening between the A.-Jarnesoni limestone and the 

 Oolite, estimated at 50 feet by Mr. C. Moore, are referred by that 

 gentleman to the Upper Lias ; but he does not give any facts in 

 support of his view ; the tract is coloured as Lower Lias on the 

 Geological- Survey map. A clay-pit opened in the sloping ground 

 between Munger Quarry and the Oolitic ridge to the north has not 

 yielded any fossil evidence as to the position of the bed in the 

 Liassic series. This is the only section in this stratigraphical hori- 

 zon known to me. It is somewhat hazardous to speculate on the age 

 of this imperfectly exposed stratum ; but if viewed by the light 

 afforded by neighbouring districts, it will seem more reasonable 

 to regard it as belonging to the Middle Lias, and probably equiva- 

 lent to the argillaceous beds of the A.-capricornus zone at Dundas, 

 which are overlain by Inferior Oolite. Such an interpretation har- 

 monizes with certain stratigraphical phenomena exhibited by the 

 Middle Lias and Inferior Oolite about Prome, which indicate a ces- 

 sation of deposit during Upper Lias times, and not of an unconfor- 

 mability between Middle and Upper Lias, which is demanded by 

 Mr. C. Moore's proposition. 



Paleontology oe the Jamesoni beds in the Eadstock Area. 



The first published list of fossils from the yellow limestone of the 

 Eadstock district is in the '■ Catalogue of Fossils of the Geological- 

 Survey Museum,' 1865 ; to which numerous additions were made 

 by Mr. C. Moore, in his ' Middle and Upper Lias of the S.W. of Eng- 

 land,' 1867. I have examined many of the specimens upon which 

 these lists are based, and others in the Bristol Museum, collected many 

 years ago, and in Mr. Tawney's cabinet, and have, moreover, 

 gathered a considerable number in situ. Prom these sources I have 

 drawn up the following emended catalogue, in which I have recorded 

 the actual numbers of specimens collected by myself during portions 

 of four days at Munger, Clan Down, and Eadstock, as affording the 

 best estimate of the frequency of occurrence of the species. I have 

 noted also the localities and areas in which the species have been 

 obtained from the same horizon ; these are indicated by the follow- 

 ing capital letters, thus : — C* Cheltenham ; A.f Aston Magna ; P.J 

 Penny Compton ; Y.§ Yorkshire ; D.|| Dorset; H.^[ Hebrides (Eaa- 

 say and Pabba) ; G.** N.W. Germany ; "W.ff Wiirttemberg ; E.JJ 

 Basin of the Ehone. 



* t Tate, Quart. Journ. Geol. Soc. vol. xxvi. 



]. Collections MM. Slatter and Beesley. 



§ Tate and Blake, Yorkshire Lias. 



|| Day, Quart. Journ. Geol. Soc. vol. six. 

 li Tate, Quart. Journ. Geol. Soc. vol. xxix. 

 ** Brauns, Untere Jura. 

 tt Oppel, Juraf. ; Queiistedt, Jura. 

 X\ Dumortier, ' Etudes Liasiques,' vol. iii. 



