62 MESSES. W. R. ANDREWS AND A. J. JUKES-BROWNE [Feb. 1 894, 



Purbeck at Lower Chicksgrove ; the highest ground here consists of 

 grey shaly clay which is exposed by the roadside, and may be the 

 thick clay which we take as the base of the Upper , Purbeck ; the 

 ground then dips into a hollow where higher beds may occur, 

 but, as the general dip here seems north-easterly, this is doubtful. 

 This very north-easterly dip, however, makes it possible that Upper 

 Purbeck Beds come on in that direction, and the anomalous beds seen 

 in an old quarry and in the railway-cutting by Chicksgrove Farm 

 may possibly belong to the Upper, and not to the Middle group. 



The third locality, where beds higher than those we have grouped 

 are present, is north of Ley Farm and south-west of Teffont Evias. 

 Here the soil is very sandy, and pieces of endogenous wood (Endo- 

 genites) frequently occur in it. We have little doubt that there is 

 here an outlier of the thick sand seen in the cuttings near Linton, 

 and immediately north of Ley Farm there is a spring — which is 

 suggestive of a substratum of clay. 



In the first instance, and before we found sand containing 

 Endogenites overlain by beds of distinctly Purbeck character at 

 Linton, we took these and other outlying patches of sand to be 

 remnants of the Hastings Sands. Now, however, we do not believe 

 that there is any representative of the Hastings Sands in the Vale of 

 Wardour : the other sandy outliers resting on Lower Purbeck be- 

 long probably to the Yectian Sand, which overlaps the narrow strip 

 of Wealden Clay. 



Those who are acquainted with the literature of the Purbeck 

 Beds and their contents will doubtless observe that, in the preceding 

 stratigraphical account, no mention has been made of the ' Insect- 

 bed ' discovered and described by the Rev. P. B. Brodie, F.G.S. 

 This omission is not due to any neglect on our part, for we have 

 lost no opportunity of searching for traces of such a bed, and have 

 sought Mr. Brodie's assistance in ascertaining the exact position of 

 the old quarry where the Insect-limestone occurred. 



Mr. Broclie found the place so altered, when he visited the spot 

 with Mr. Andrews in 1888 after the lapse of more than 40 years, that 

 he was unable to recognize the exact site of the quarry, but it was 

 " at the bottom of the field opposite the railway-station, not far from 

 the road, and near the river." There is a pond in the position thus 

 indicated : it is possible that this is on the site of the quarry, and 

 that the Arehceoniscus-bed is here brought up by the anticlinal seen 

 in the railway-cutting. Mr. Brodie informs us that the limestone 

 of the ' Insect-bed ' was stacked in some quantity at the time of 

 his first visit (in 1840), and it had without doubt been quarried from 

 below the level of the water which then occupied the bottom of the 

 quarry : the Arclaeoniscus-bei, or, as he calls it, the ' Isopod-lime- 

 stone,' being visible above the water-level. 



In a later paper x Mr. Brodie gave a section taken by the Rev. 0. 

 Fisher in a quarry on the south side of the river Nadder, near ■ 

 Teffont Mill, where a laminated limestone does occur in the position 

 1 Quart. Journ. Greol. Soc. toI. x. (1854) p. 476. 



