Dr. H. H. Swinnerton—Organie Remains in Trias, 229 
Fic. 2. Trachyte-porphyry (near keratophyre), Tharsis. Contains phenocrysts of 
orthoclase, albite, and corroded quartz. The ground-mass is a felt of 
very fine felspar laths with abundant coarser quartz grains, x 36. 
Fic. 3. Sheared porphyry, Sotiel. Quartz phenocrysts have been crushed and 
granulated, felspars have been converted to aggregates of sericite fibres, 
and the ground-mass to a very fine felt of quartz and sericite, with 
a highly developed schistosity. x 36. 
_V.—Oreanic Remarns In THE Trtas oF NorrineHam. 
By H. H. Swiynerton, D.Sc,, F.G.S., F.Z.8. 
(T\HE city of Nottingham is built upon the outcrop of the Trias. 
Building and road-making operations consequent upon its rapid 
growth often lead to the laying bare of the underlying Bunter, 
Keuper Waterstones and Marls. Unfortunately the work is usually 
carried on with such rapidity that good exposures are often missed. 
A temporary cessation of activities in one part of the Sherwood 
suburb, however, left a beautiful exposure of the Waterstones. 
A careful examination of this during the past few months has led 
to the discovery of footprints and fish-remains. The footprints are 
of a type which does not seem to fit into the generally used system of 
classification. In 1857 the Rev. A. Irving found a Cheirotheroid 
print in the railway cutting at Colwick. ‘his is the only record of 
the previous discovery of footprints in this district. 
Well-preserved remains of fish (Semzonotus) are fairly common 
in one layer of light-coloured sandstone only 23 inches thick. 
The upper surface of this is partly covered with small, ill-defined 
ripple-marks. The fish seem to have been left stranded upon this, 
and in their struggles to escape have made depressions and become 
buried in the sand they stirred up. The remains are buried in 
lenticular pieces of sandstone which can be lifted bodily out of the 
depressions. These vary in size from a few inches across to a couple 
of feet. The horizon at which they occur is evidently higher than 
that at which similar remains were found by Edward Wilson at 
Colwick in 1879. 
The scales, fin-rays, and some bones are often perfectly preserved, 
but being embedded in sandstone they have to be dissected out with 
great care. As this is a tedious process, it seemed advisable to 
announce the find without delay. | 
REVIEWS. 
——— 
Tue Coat Bastn or CommMeEntrRY IN CENTRAL FRANCE. 
fF\HIS is the title of a paper by Mr. J. J. Stevenson (Ann. New 
York Acad. Sci., xix, p. 161, February, 1910). The basin was 
described in 1887 by Henri Fayol as about 9 kilometres long, 
3 kilometres wide, and 700 metres deep; and it is isolated from 
two other small basins mainly by granite, the basins having been 
separated just prior to the time of the Coal-measures. Thus the 
deposits were always distinct, a conclusion formed by De Launay and 
