102 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [June 17, 



ton, which he most carefully measured ; and in this he describes 

 " Pisolite (Pea-grit) and Ferruginous Oolite (Belemnite-bed) and 

 sand" (just including 2, 3, and 4 of the above section) as 42 feet 

 in thickness ; and upon this he offers the following remarks : — It 

 consists of a " coarse oolite in the upper part, and of the very peculiar 

 large-grained Oolite or Pisolite {Pea-grit) in the lower. A few 

 miles to the south the pisolite disappears, and is replaced near Pains- 

 wick and at Haresfield Hill by strata containing oolitic grains in a 

 brown paste. This is the precise equivalent of the well-known 

 oolite of Dundry, near Bristol, which may be recognized as far off 

 as Bridport, on the Dorset coast. At Leckhampton the pisolite 

 rests on a few feet of ferruginous oolite and sand. The total thick- 

 ness of this portion of the series is 42 feet*." These views are 

 also stated in a paper by my friend the Rev. P. B. Brodie, to which, 

 indeed, Mr. Strickland's section was an appendix. 



Recently, more extended observations in the South Cotteswolds, 

 as in the Stroud district, have shown that between the tenacious 

 Upper Lias Shales and the beds of true Oolitic structure, we have a 

 variable thickness of from 50 to 70 feet of an incoherent sandy rock, 

 with occasional bands and nodules of a bastard freestone intersecting 

 it ; and this bed has by the Government Surveyors been distinctly 

 mapped as " Oolite Sands." Lately, however, Dr. Wright pro- 

 poses to add not only these sand-beds, but a true oolitic, and occa- 

 sionally pisolitic, rock above this, to the Upper Lias ; a view which 

 he attempts to substantiate mainly by appealing to certain species of 

 Cephalopoda occurring in the bed above the sand at Frocester Hill, 

 which, as some of them are undoubtedly Liassic, he would designate 

 as witnesses of character*)*, and would tell us that the evidence 

 derivable from the presence of a multitude of Oolitic mollusca with 

 which the Ammonites are mixed — in a rock, too, of oolitic structure 

 — is of no value whatsoever. I here give an analysis of the fossils 

 obtained from Frocester Hill, founded upon a list for which I am 

 indebted to the kindness of my friend Mr. John Lycett ; many of 

 these fossils have also been found by myself and others ; and the 

 results are confirmed by my own observation of this newly-named 

 Cephalopoda-bed of the so-called Upper Lias : — 



Analysis of the fauna from the Basement Oolite of Frocester Hill : 



Species. Common to the Lias. 



1. Ammonitidse 15 ... 5 



2. Belemnitidae 3 . . 3 



3. Gasteropoda 1 . . 



4. Lamellibranchiata % .... 21 .. 



5. Brachiopoda % 3 .. 3 



Total 43 .. 11 



* Quart. Joum. Geol. Soc. vol. vi. pp. 250, 251. 



t 1 would here suggest that the Cephalopoda, heing inhahitants of deep seas, 

 and possessed of such wonderful powers of locomotion, are much weaker as wit- 

 nesses than the non-nomadic Lamellihranchiata. 



X Many of these extend high up in the Oolites : prohably a few go throughout 

 the Oolite-beds. 



