﻿Vol. 64.] THE FOSSILIFEROUS SILURIAN ROCKS Or TORTWORTH. 517 



the upper and the lower trap-bands. The principal fossiliferous 

 localities are : — 



(a) By the stream at Avening Gi'een ; 



(5) The small quarry and road-cutting south of Damery Bridge. At 



both Avening Green and Damery the sections have been recently 



opened up ; 



(c) Ironmill Wood ; and 



(d) By the stream 25 yards north of Crockley's Farm, Nothing is now 



exposed in place, but many fossils may be obtained from debris at 

 either of these two last-named localities. 



Lists of fossils from Avening Green and Damery are given in 

 the previous paper already mentioned, and a large number of 

 additional species has been obtained (see list appended to this 

 paper, p. 538). 



The commonest fossils are those mentioned on p. 514 as prevalent 

 in the Charfield-Green area, with (in addition) Tentaculites anglicus, 

 Orihis elef/antula, RTiynclionella serrata, Striclclandinia lirafa, 

 Leptcena rliomhoidalis, Sti^ophomena compressa, ISpirifer crisjpus, 

 and Horiostoma globosum. The only graptolite from the Tortworth 

 district with which we are acquainted is a well-preserved Mono- 

 graptus priodon from Damery, in the Museum of Practical Geology, 

 Jerrayn Street, London. 



The rocks mentioned above lie below the trap of Avening Green 

 and Crockley's Parm, and there is no visible evidence as to the 

 nature of the rock overlying the trap in the area to the west of 

 Avening Green. Several trenches were dug, with the view of 

 clearing up this point : two of these were to the south of the 

 Tortworth footpath, about 200 yards south-west of Avening 

 Green. These were taken to a depth of 4^ feet (the southern) and 

 3| feet (the northern) without entering the rock in situ ; but the 

 abundance and uniformity in character of the blocks of micaceous 

 flaggy sandstone met with showed that this might be safely taken 

 as the rock occurring here. The presence of StricJclandinia lirata 

 with. Horiostoma globosum and Phacops Downingi(E(l) shows that 

 the deposit is of Llandovery age. Two other trenches at points 

 about 350 yards north-north-east of Tortworth Church were in 

 Keuper marl, but in one case red Silurian grit was reached below 

 the marl. 



There are now no exposures of Llandovery rock at Tortworth 

 itself ; but Lord Ducie's collection contains Sirophomena compressa 

 from ' near Tortworth Church,' and some of the older collections, 

 such as Lord Ducie's and that in Jermyn Street, contain a good 

 many fossils labelled ' Tortworth.' It is probable, however, that in 

 some cases the label is intended to bear a general reference to the 

 district as a whole. 



(c) The Daniel's-Wood^ Area. 



The only exposures in this region are in the bed of the little 

 stream traversing the southern part of the wood. In the previous 



^ This is referred to as * Priests Hill ' in the maps by Sanders and the 

 Geological Survey, 



