VOL. XV. (1) RHATIC ROCKS 27 
capped by a massive bed of sandstone—the equivalent of 
the true Rhetic Bone-bed. 
Now the changes this Bone-bed undergoes in its lithic 
structure in North-west Gloucestershire have been already 
demonstrated: how in the cliff section at Wainlode it 
passes from a thin pyritic bed, full of fish-scales and teeth, 
into a brown sandstone without fish-remains and about a 
foot thick ;* and that as such it is visible in the road- 
cutting at Bushley, near Tewkesbury,* and at Bourne 
Bank, near Defford,3 where it is two feet in thickness. 
In the early part of this paper* evidence was quoted 
to show that this thick deposit of sandstone occasionally 
acquires a “bone-bed” nature. In the section three- 
quarters of a mile north of Croome D’Abitot Church, the 
Bone-bed-equivalent is exposed 2 feet 11 inches above the 
“Tea-green Marls,” but no sandstone-bed is present 
between the latter deposit and the shales. In the area, 
therefore, between that locality and Crowle, bed 17 has 
come in; and, as a matter of fact, we can state that it has 
come in between Muckenhill and Croome D’Abitot. To 
return to the Crowle section, I foot 8 inches above 
this Bone-bed-equivalent is a series of sandstone layers, 
separated by clayey partings, collectively nine inches in 
thickness, and it constitutes the most fossiliferous deposit 
in the section. It was in what the writer considers to be 
the equivalent bed near Deerhurst that the new species of 
Fleterastrea, described by the late R. F. Tomes under the 
appropriate name of 7. rhketica was obtained. About 
four inches of brown shales with thin sandstone layers 
succeed, and are capped by a deposit of black shales. 
Above again is débris of a sandstone-bed—possibly having 
a thickness of four inches. 
1 Proc. Cotteswold Club, Vol. xiv., p. 133. 2 /bzd., p. 150. 3 Jbid., p. 153. 
4 p. 22 of this paper. See also Quart. Journ. Geol. Soc., Vol. Ix. (1904), p. 349. 
