14 MR. L. RICHARDSON ON THE RH^TIC OP [Feb. I9II, 



The next section, also in the foreshore, is that depicted in PI. II. 

 Here each individual layer can be readily investigated and searched 

 for fossils, which are abundant — especially in the Pleurophorus 

 Bed — and well-preserved. It was here that the details recorded 

 on p. 17, under the heading ' Foreshore Section near the First 

 Gypsum-workings,' were obtained, and the numbers in PI. II 

 correspond to those tabulated in that record. 



It is unfortunate that it has not been possible to connect the last 

 section with that exposed at Blue Anchor Point, where the beds are 

 accessible again ; but, as already remarked, the Blue- Anchor-Point 

 section is a very difficult one to examine, and the investigation of 

 the higher beds is not unattended by actual danger. 



The main Bone- Bed (15) was not visible in the Point section 

 when I visited the locality ; but I procured some excellent specimens 

 loose on the cliff-slope, by working along in the direction of the 

 Point from the section by the path-side near the gypsum-workings. 

 Typically, the bed is a very hard, grey, compact siliceous sandstone, 

 crowded with fish-scales and teeth and occasional fragments of 

 bone. The surface of the main bed, where it rises along the fore- 

 shore forming that conspicuous reef (PI. II), has a distinctly gritty 

 appearance — the grains weathering out very distinctly along with 

 the vertebrate remains. But the bed is subject to some variation 

 for, by the pieces picked up on the cliff-side, it is seen to comprise 

 several layers, the topmost of which consists, in its upper part, of 

 the same kind of siliceous material as that in the foreshore, but 

 dull greyish-blue, rarely vertebratiferous limestone in its lower. 

 Occasionally the uppermost layer also is shelly, containing indeter- 

 minable examples of a species of Isocyprina. 



The Bone-Bed of Blue Anchor is probably on the horizon of the 

 series of beds included under 1 5 at Lavernock Point. At Laver- 

 nock, strange to saj T , there is no distinctive Pleurophorus Bed. 

 Where it is to be presumed that it should come is a marked line in a 

 black-shale deposit, with thickly-laminated shales below and thinly- 

 laminated shales above. Then comes Bed 9 — a limestone-band, 

 frequently nodular, which (there can be little doubt) is correlative 

 with a similarly-numbered bed at Lilstock and in the railway- 

 cutting at Charlton Mackrell. Shales, quite twice as thick as at 

 Lavernock, separate from Bed 5 6 the limestone which I consider 

 to be on the horizon of Bed 9. 



The identification of Bed 5 b at Blue Anchor Point is very im- 

 portant, as it affords a sure datum-level for correlative purposes, 

 connecting this section with that at Bishton, near Newport (Hon.), 

 and with that at St. Audrie's Slip to the east of Watchet. As 

 regards lithic structure, it is difficult to separate hand-specimens 

 of the bed from these three localities, and the principal fossils 

 occur in about the same proportion, as regards numbers, at the 

 several localities named. 



At Lavernock Point, where I measured the section which I have 

 published, 1 there is a non-sequence between the ' White Lias ' and 



1 Q. J. G. S. vol. lxi (1905) table facing p. S92. 



