LECHMERE GUPPY OLDER ROCKS OF TRINIDAD. 108 
€C Arduvos do Museo Nacional do Rio de Janeiro.” From 
the Geological Commission of the Empire of Brazil . 
“ On the Miocene Fossils of Haiti.” By R. J. L. Guppy 
“ On the Land and Freshwater Molluska of Nicaragua.” 
By Ralph Tate, F.G.S. 
“ Triibner’s Literary Record,” Nos. 114-126. From the 
President . 
The following communications were read : — 
I. On tke Physical Geography and Fossils of the Older 
Rocks of Trinidad. By R. J. Lechmere Guppy, 
F.L.S., F.G.S., C.M.Z.S., President of the Scientific 
Association of Trinidad, etc. 
1. General Considerations . 
The older rocks of Trinidad were described by Messrs. 
Wall and Sawldns in their Report on the Geology of Trinidad 
under the name of the “ Caribean Group.” The age of the 
series was not determined by them, although they surmised 
it to be of considerable antiquity. The position as well as 
the lithological structure of these rocks are such as lend 
strong support to the theory of their great age ; but the 
absence of fossils rendered all attempts futile at a nearer 
determination. 
The series in question occupies a considerable portion of 
the litoral cordillera of Venezuela, and extends eastward 
through the north of Trinidad to Tobago. It is composed 
of gneiss, gneissose, talcose, and micaceous slates and crystal- 
line and compact limestones. The compact limestones 
however, may possibly be of a much later age than the 
other portions of the group — they lie unconformably upon 
the upper beds of the metamorphic slates. 
