56 Rev. P. B. Brodie on the Geology of the 



tion (in descending order) of Green's quarry on the summit of 

 the hill :— 



ft. 



1. Rubble, about 2 



2. Oolite marl 4 or 5. 



3. Soft, shelly, white and yellow, though sometimes 



brown oolite, not quarried deep. 



The oolite marl is nearly identical with that near Chelten- 

 ham, though rather darker in colour, and much reduced in 

 thickness. It is loaded with corals as at Crickley, many of 

 which, as far as I could judge, appear to belong to the same 

 species as those in Gloucestershire. Some parts of the bed are 

 softer and full of shells, among which I procured several species 

 of Cerithium, Nerincea, Natica, and other genera. Natica macro- 

 stoma? is abundant, and a species of Rostellaria also occurs, though 

 rarely ; the edges of the beds have been much waterworn, pro- 

 bably by currents, and the shells are exposed in relief, and are 

 much weathered in consequence. I sent a small collection to 

 our colleague Mr. Lycett, and he states that although the greater 

 number were new to him, yet the tendency of the others is 

 towards the Inferior Oolite, and agree specifically with some in 

 our district. Such for instance as the Natica adducta (an oolite 

 marl shell), but also found in the Great and Inferior Oolite of 

 Yorkshire; Trigonia striata, from the Roestone and Gryphite 

 grit ; while at the same time there is a new species of Acteonina, 

 Monodonta, &c. At so great a distance we must expect this to 

 be the case, and the identity of a stratum (where the order of 

 superposition is clearly defined) may be sufficiently proved if we 

 can find a few distinctive species in both localities, and among 

 these the Natica macrostomat* is certainly one, a fine series being 

 preserved in the Grantham Museum. It is to be hoped that a 

 larger collection will soon be made, and a careful comparison in- 

 stituted between the Inferior Oolite fossils of Gloucestershire and 

 Lincolnshire. Much has yet to be done in the Oolites generally 

 in England, and with the exception of the standard and inva- 

 luable work, ' The Geology of England and Wales/ by Conybeare 

 and Phillips, and a few local papers, very little is known of the 

 oolitic districts N.E. of the Cotswolds, especially in Lincoln- 

 shire, Rutlandshire and Northamptonshire ; and a wide field is 

 open for the research of an active and intelligent geologist in 

 that quarter; and as our science is strictly a progressive one, in- 

 exhaustible and as yet hidden treasures, rich in their way as the 



* With respect to this species, Mr, Lycett is of opinion that it cannot 

 be referred to any known species, and he proposes to call it Natica Leck- 

 hamptonensis. It appears to be confined to the oolite marl, as many others 

 are, and I have never yet seen it in any of the superior or inferior beds. 



