TRANSACTIONS OF SECTION C. 745 



4. All characters, capable of numerical statement, including size, proportion of 

 parts or lines, angle, &c., must be so given. [N.B.— Adequate figures may suffice 

 for this.] 



5. The type specimen must be permanently placed in a public museum in the 

 United Kingdom. 



N.B.— It is not necessary that the type specimen in the above sense should be 

 the first anywhere described under the registered name, but only the first that 

 satisfies the above conditions. 



It is suggested that registered types should be quoted as B 1, B 13— e.g. 

 Terebratula bijylicata, B 1, or Phacops caudatus, B 13— B standing for British, 

 and the number for that of the year of the century. Specimens ditferiug notably 

 from the type, but included in the same species, might be quoted as (B 1). 



7. The Outcrop of the Corallian Limestones of Elsworth and St. Ives. 



By C. B. Wedd, B.A., F.G.S. 



[Communicated by permission of the Director-General of H.M. Geological Survey.] 



The ferruginous and oolitic limestones known as the Elsworth and St. Ives 

 Rocks are now generally believed to be one and the same, an opinion supported by 

 my own work in that district recently. The limestone in question has long been 

 known to occur at St. Ives in brick-pits, being well exposed to the west of the 

 town. It was known also to occur throughout the village of Elsworth. Mr. 

 Cameron noticed a fossiliferous rock outcropping near Hilton, between Elsworth 

 and St. Ives. No other surface exposures were known, but a similar rock was 

 found in the railway cutting at Bluntisham, north-east of St. Ives, at Swavesey, 

 east of the same place, and Bourn, south of Elsworth, and a few other localities, 

 and like rock was found in Wells. 



The outcrop can be traced almost continuously from a mile west of the brick- 

 yard at St. Ives, striking eastwards along the northern flank of the Oiise valley, 

 and passing north of St. Ives to Needingworth ; here it bends abruptly southwards 

 to Holywell and forms a gentle rise. The southern part of the village of Holywell 

 stands on a gravel-capped escarpment of the rock; a collection of fossils in the 

 Woodwardian Museum, Cambridge, agreeing closely with those of the Elsworth 

 and St. Ives Rocks, was believed to have come from Holywell. East of Holywell 

 the outcrop must cross the Ouse valley ; I found traces of the rock in a drain some 

 distance west of Swavesey. From here, south-westwards, it is not seen again till 

 it appears at the surface between Hilton and Coningron, where a rock was noted 

 by Mr. Cameron. Southwards from here the outcrop crosses a valley to tlie rising 

 ground west of Elsworth, through which village a narrow tongue of the rock runs 

 still further south. The main outcrop, however, flanks the northern slope of the 

 drift-capped high ground to the west, and can be traced along the slope through 

 Papworth Everard, westwards to Yelling, following the contour of the ground. 

 At both of these localities there are good and highly fossiliferous exposures in 

 streams. Thence the outcrop disappears southwards under drift, but the rock may 

 be seen again to the south, less than two miles south of Croxton, in a ditch in the 

 valley of the Abbotsley Brook. 



To the north, east, and south-east of the line of outcrop of this limestone, the 

 ground is occupied by Ampthill clay, to the west by Oxford clay. It will thus be 

 seen that the Elsworth and St. Ives Rocks, besides agreeing closely in their fauna, 

 outcrop along the same line of strike, with Ampthill clay above and Oxford clay 

 below. The dip is always small, and the rock at Bluntisham, if it reaches the 

 surface at all, does so probably as an inlier, though it maybe directly connected at 

 the surface with the outcrop east of St. Ives. 



8. Report on the Exploration of Caves at Uphill, near Weston-super-Mare. 



See Reports, p. 342. 



