VOL. XVII. (i) INFERIOR OOLITE— SOUTH COTTESWOLDS 75 



Anabacia-Limestones of the Bath-Doulting district, and its 

 naming by Dr Henry Woodward, F.R.S., afforded an oppor- 

 tunity of pointing out in a short note entitled " On the Strati- 

 graphical Position of the Beds from which Prosopon Richardsoni, 

 H. Woodward, was obtained," the probable equivalents of the 

 Doulting Beds in the South Cotteswolds.' In the Bath-Doulting 

 district, above the Upper Coral-Bed, the subdivisions that have 

 been made are the Doulting-Stone, Anabacia-LiTnestones, and 

 Rubbly-Beds. The Doulting-Stone finds its equivalent in the 

 local Clypeus-Gvit of Horton and of Scar Hill, Nailsworth ; the 

 Anabacia-Limestones in Witchell's White Oolite at Horton; 

 while the Rubbly-Beds are represented in the variable deposit, 

 as regards thickness, that caps this White Oohte and yields 

 Terebratula globata, auctt. non Sow., abundantly. 



Lastly, in 1908, the Geologists' Association visited that 

 portion of the South Cotteswolds which hes between Stroud 

 and Wotton-under-Edge, and the stratigraphical details re- 

 corded in the present paper, in so far as that portion is 

 concerned, were pointed out on the ground and checked.- 



This brings the historical retrospect down to the present 

 time, and prepares the way for the presentation of Plate XXI., 

 which shows the subdivision and correlation of the Inferior- 

 Oolite rocks of the South Cotteswolds that has been accom- 

 . plished by the exertions of former investigators, combined with 

 the contributions of the present writer. 



(ii.) On the Lower and Upper Limits of the Inferior-Oolite 

 Series. — At the southern end of the South Cotteswolds the 

 Inferior Oolite is about 30 feet thick, and at the northern, 

 about 182 feet 8 inches. Above, throughout the South Cottes- 

 wolds, is the Fullers' Earth ; below, the Upper Lias (Toarcian) . 



" In the Bath-Doulting district there is no Inferior-Oolite 

 deposit of pre-GarantiancB date." The deposit of this date, the 

 Upper Trigonia-Grit, there rests directly, but non-sequentially, 

 upon the Liassic beds, except in the immediate neighbourhood 

 of the Mendip Hills. North of the Avon Valley, however, ad- 

 ditional beds begin to come in between the Upper Trigonia-Gvit 

 and the Upper Lias, and eventually these two deposits, which 

 are in apposition at the southern end of the South Cotteswolds, 

 are parted by at least 160 feet of strata at the northern end. 



I Geol. Mag., 1907, pp. 82-84. 2 Proc. Geol. Assoc, vol. xx. (1908), pp. 514-529. 



