The Quarterly journal of the Geological Society of London . ng the lines of far the surface-limits of this Ehsetic tract extend it is not easyto ascertain with exactness; judging, however, from the contour of thesurrounding land, an estimate of its size and position may, I think, ^ Since this paper was read, I have discovered, in the old undisturbed parts ofthe , traces of strata in sitti belonging to the Eh£etic series higher thanthose described. 1867.] BtTETON EH^TIC BEDS NEAE GAINSBOEOirGH. 321 with some degree of probability be made out; and I have endea-voured in the a
The Quarterly journal of the Geological Society of London . ng the lines of far the surface-limits of this Ehsetic tract extend it is not easyto ascertain with exactness; judging, however, from the contour of thesurrounding land, an estimate of its size and position may, I think, ^ Since this paper was read, I have discovered, in the old undisturbed parts ofthe , traces of strata in sitti belonging to the Eh£etic series higher thanthose described. 1867.] BtTETON EH^TIC BEDS NEAE GAINSBOEOirGH. 321 with some degree of probability be made out; and I have endea-voured in the accompanying map, taken from the Ordnance Survey,to define them. To the east of the Triassic escarpment, extendingfrom the Ehaetic cutting at Lea northwards towards Gainsborough,the land lies in a gentle slope, rising again, though very slightly, ata distance of less than a mile on the average, with an outcrop ofLiassic clays; and in the hollow between these ridges, judging from Pig. 2.—Sketch Map showing the extent of the Bhcetic Bedsnear ^^m Ehaetic the direction of the dip, and the general trend of the land, it ap-peared to me likely that the Ehaetic beds would be found on thesurface; and hearing that a well had been dug in the line of thisdepression, near a farm-house marked on the map, about 3 milesnorth of the Lea-beds, I examined the earth thrown up, and found,as I anticipated, the various stones and shales of the Ehaetic zone, 322 PROCEEDINGS OF THE GEOLOGICAL SOCIETf. [JuHO 5, undiminished to all appearance in size and thickness, the mainstone band and the other prominent strata, with their accompanyingfossils and stock of pyrites, seeming all to be present as at Lea. Taking the entire depression between the Kenper and Lias outcrops,and presuming it to be occupied with the Rhaetic beds, as in all pro-bability it is, we get an area of from 3 to 4 miles long, and from ia mile to 2 miles broad, as the surface-extent of this northern de-p
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
