THE UPPER KEUPER AT SHREWLEY. 
68 
were of opinion was a Gloeotrichia related to Gloeotrichia Pisum. 
Id was intermixed with Aphanizomenon flos-aquce , in long trails, on 
the tranquil water of the gulf. These trails disappeared when the 
water was agitated, and reappeared when it became calm. 
Professor Farlow, of Harvard University, observed (in 1888) 
the lake Minnetonka, Minnesota, U.S., covered with Rivularia 
fluitans, and Nostoc cceruleum ; a strong wind on the following day 
caused them to disappear. Specimens of the first-named alga were 
submitted to MM. Bornet and Flahau.lt, who pronounced them to 
belong to the genus Gloeotrichia , near G. Pisum. 
The above graphic descriptions of phenomena, in all respects 
analogous to those which take place in our Shropshire meres and 
pools, will convey a better notion of their general features than any 
description I can give ; and will, at the same time, show how 
widely their occurrence has been observed in this and other 
countries. 
(To be continued.) 
A DESCRIPTION OF A SECTION IN THE UPPER KEUPER 
AT SHREWLEY, IN WARWICKSHIRE, 
TOGETHER WITH A 
NOTE ON THE DISCOVERY OF CESTRACIONT FISH REMAINS 
THEREIN. 
BY P. RICHARDS AND GAVIN JACK. 
At Shrewley, a village five miles north-west from Warwick, 
there is exposed in a small quarry a very good section in the 
Upper Keuper Sandstone. This quarry is the only opening known 
to us in the Upper Keuper Sandstone in this county. 
The following is a description of the beds in order of deposition. 
Immediately above the red marl there is about 9ft. 6in. of 
green sandy marls, with Estheria , and at the base a bed about 
4in. thick, containing rolled pebbles about the size of a pea. 
This bed will be more minutely described subsequently. Next 
follow 9ft. of close-grained sandstones, interbedded at intervals 
. with green marl; at the base of these sandstones, fish of the 
genus Semionotus have been found. The sandstone forms an excellent 
building stone. Three feet of green marl overlies the sandstone, 
March, 1893 . 
