440 MR. L. RICHARDSON ON THE INFERIOR OOLITE [Nov. I907, 



Midford and Great Rissington are far apart, and to claim con- 

 temporaneity for the ' Globata-'Bed ' at the two localities may 

 appear rash. Nevertheless, I feel satisfied that such is the case. 



The Fullers' Earth of Great Rissington is barely a foot thick. 

 Above it are the basal Great-Oolite beds — pale-brown, non-oolitic, 

 and rotten-looking limestones, frequently almost entirely composed 

 of shell-debris (Ostrece of the 0. acuminata-type). When weathered, 

 these shell-fragments become white, and are then very conspicuous 

 on the surface of the rock. The succeeding strata are greyish 

 limestones, with few oolite-granules and a matrix of calcite. They 

 are, as a rule, fairly regularly bedded, shelly, and of a browner colour. 

 But their most characteristic feature consists in the occurrence of 

 black specks — which are sporadically distributed throughout the 

 rock, and proved, on being dissolved out, ignited, and tested with 

 lime-water, to be carbon (coal). These black-speckled and rather 

 uninteresting-looking limestones occur over a fairly-extensive area. 



The junction of the Rubbly Beds with the overlying deposits is 

 rarely seen in this district, but Mr. H. B. Woodward, E.R.S., 

 notices two — one 



' north-east of Dodd's Mill, Barrington Spinneys,' which ' showed apparently 

 the upper beds of the Inferior Oolite, consisting of about 6 feet of rubbly and 

 marly oolite, with grey clay in pockets on the top ' ; and the other ' east of the 

 county-boundary at Little Barrington,' where again clay was seen resting upon 

 ' pale, coarse-grained oolite, lime-washed : Clypetis Ploti, Terebratula globata 

 [auctt.].' 1 



Therefore it should be noticed that, wherever in this district the 

 junction of the Clypeus-Gvit and the succeeding bed has been 

 seen, no intervening limestone-deposit answering to the Chipping- 

 ISTorton Limestone has been observed — the Pullers' Earth rests 

 directly upon the Bubbly Beds. 



III. Description of Sections. 



The most important exposures are at Great Rissington, because 

 within a very short space nearly the complete sequence from Upper 

 Lias to Great Oolite can be made out. 



Passing through the village, and therefore over the outcrop of 

 the Upper Lias, two quarries will be seen on the left-hand side of 

 the road : in the first are the ' Massive Beds ' of the Clypeus-Grit, 

 capped by the Rubbly Beds ; in the second quarry the lowest 

 beds seen are rubbly limestones, some of which are coarsely oolitic, 

 others pisolitic. But in neither of these varieties of rock are fossils 

 common. Clypeus Ploti occurs very abundantly in the associated 

 softer oolitic material, and ' Terebratula globata ' and Pholadomya 

 Murchisoni are not infrequent. The information obtainable here 

 is best presented as follows :— 



1 ' The Jurassic Rocks of Britain— The Lower Oolitic Bocks of England 

 (Yorkshire excepted) ' Mem. Geol. Surv. vol. iv (1894) pp. 144-45. 



