116 LOWER OOLITIC ROCKS OF ENGLAND: 
Trigonia striata (Fig. 9). 
Khynchonella concinna (Fig. 
77). 
Lycetti. 
subobsoleta. 
subtetrahedra. 
Tatei. 
Terebratula curvifrons. 
fimbria (Fig 23). 
maxillata (submaxillata) 
(Fig. 78). 
Terebrabula plicata. 
Waldheimia carinata. 
Leckenbyi. 
Eryma elegans (Guisei). 
ComoseriB vermicularis. 
Convexastrasa Waltoni. 
Isastraoa limitata. 
Latimseandra Fleming!. 
Stylina solida. 
Thamnastraea defranciana. 
Thecosmilia gregaria. 
This division has by some authorities been placed in the sub- 
zone of A. Sowerbyi. 
EAG STONES. 
This general name is applied to the upper beds of the Inferior 
Oolite in the Cotteswold area : beds that furnish little or no free- 
stone. They comprise layers of more or less earthy ferruginous 
and oolitic limestone, and are far more fossiliferous than the Free- 
stones below. Occasionally they yield blocks serviceable for 
building-purposes, for rough walling, &.C., but they are chiefly 
employed for road-metal. They are from 20 to 40 feet thick. 
Very many local divisions have been made, to which the name 
" Grit " has unfortunately been applied, for, strickly speaking, this 
term should be confined to coarse-grained sandstones. The 
" Grits " of the Oolitic series are for the most part earthy lime- 
stones, and occasionally calciferous sandstones, as is the case with 
certain beds in the Corallian Series. 
In this Upper Division of the Inferior Oolite Series \ve have 
locally the " Gryphite Grit," a term used by Murchison in 1834, 
because the beds are characterized by Gryphaa sublobata, a form 
which occurs very abundantly. 
The " Trigonia Grits " (recognized by Murchison and Buck- 
man in 1815) of which two horizons were pointed out by Lycett 
in 1857, are characterized by an abundance of Trigonias, but the 
upper bed is more extensively developed than the lower. A 
" Chemnitzia Grit " has also been noticed locally by Dr. Wright 
in association with the Lower Trigonia Grit ; but the forms at 
one time identified as Phasianella and Chemnitzia, are now named 
Bourguetia and Pseudomelania. 
On top of these Grits there are beds characterized by an abun- 
dmce of Clypens Ploti ; to them the name " Olypeus Grit" has 
been applied ( = Clypeus Brash of J. Buckman) ; and in this 
subdivision a " Pholadoinya Grit " was noticed by Lycett. 
Again, from the prevalance of Rhynchonella spinosa in all these 
Grits or Kagstones, the term " Spinosa-stage " was applied to 
them collectively by Lycett. 
In some localities above the Clypeus Grit there have been 
noticed certain beds of pale oolite termed the White Oolite (or 
Freestone) by Witchell.* This bed is not very fossiliferous, but 
it contains Terebratula globata, Trigonia, and Pecten. 
* Proc. Cottesw. Club, vol. vii. p. 117. 
