On the Rhætic Beds near Gainsborough

Open Access
Publisher Website
Google Scholar
Abstract
A t the Meeting of the British Association at Nottingham in 1866, I announced the discovery of the Rhætic beds at Lea (a village about two miles to the south of Gainsborough), which the lowering of the gradients of the Great Northern line from Gainsborough to Lincoln had laid bare. At the time this announcement was made, the cutting at Lea was only partially worked out. Now, however, that the line is in a more complete state, I am enabled to give more accurate sectional and stratigraphical details than I could then. The following is a section of the various beds in the order in which they occur. The first traces of this Rhætic tract, for it can boast of only a very limited surface-area, occur a little beyond the third bridge, about a mile and a quarter from the new station at the south end of the town of Gainsborough, where the lowest the lowest bed of the series, No. 1 in the section, is seen resting unconformably, though with parallel stratification, on the blue marl of the Keuper beneath. This bed consists of a rather loose micaceous sandstone of a greenish grey colour, containing a few specimens of Avicular contorta , with worn bones, teeth, and coprolites, and is (where not affected by the unevenness of the underlying Triassic marl, the hollows of which it fills up) on the average about a foot in thickness. In one part, near the outcrop of this lowest bed, lying directly on the blue

This publication has 0 references indexed in Scilit: