Abstract
General Portlock, in his Geological Report on Londonderry, Tyrone, and Fermanagh (1843), was the first to direct attention to certain beds linking the Triassic and Liassic formations. In that Report he refers to the occurrence of beds at Colin Glen, Belfast, characterized by the same Shell ( Cardium striatulum ) as that which occurs in the Lisnagrib section (pp. 49, 56, 107). It is now my purpose to describe in detail the strata thus referred to, and their extension to neighbouring localities. Within the last few years the stratigraphical relations and the fauna of the Lower Liassic and Avicula-contorta series, as developed in England, have been made known by the labours of Dr. Wright and Mr. Charles Moore.
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