. The geology of the country between York and Hull. (Explanation of quarter-sheets 93 S. E., 94 S. W., and part of 86) . nder BoulderClav. Gravel of Dry Chalk Valleys.—In bottoms of all the valleysin the Chalk, especially when they are of any size and are notcut down to the clays below, there is a deposit of gravel composedof chalk fragments and flints, which has evidently been formedby the disintegration of the beds in situ, and has not beenbrought from a distance. The formation of this gravel seems tobe going on to a great extent at the present time, and in manycases is probably due to the w
. The geology of the country between York and Hull. (Explanation of quarter-sheets 93 S. E., 94 S. W., and part of 86) . nder BoulderClav. Gravel of Dry Chalk Valleys.—In bottoms of all the valleysin the Chalk, especially when they are of any size and are notcut down to the clays below, there is a deposit of gravel composedof chalk fragments and flints, which has evidently been formedby the disintegration of the beds in situ, and has not beenbrought from a distance. The formation of this gravel seems tobe going on to a great extent at the present time, and in manycases is probably due to the wash from the steep banks on eitherside. A section in these beds was exposed at the side of therailway, about a mile above Goodmanham Spring, which showedhorizontally stratified gravel, composed chiefly of chalk flints,below brown sandy beds with a few flints; the stratification of theselatter being bent round in hollows of the lower bed, showing thatthe support had given way since their deposition. Fig. 2. Section in Chalk Valley Gravel. Railway cutting near Goodmanham Lodge, Market Weighton and Beverley a. Brown sandy soil with a few chalk flints; the stratification being bentround in the depressions. b. Gravel or wash of chalk flints, chalk and sand ; horizontally stratified. c. Talus. SUPERFICIAL DEPOSITS. 35 The relation of these gravels to those along the east flank ofthe Chalk is very obscure, but it is very probable that they areof the same age. Where these valleys come down to the flats ofHolderness no division can be made between them. In many places on the Wolds is found a curious deposit, locallyknown as gruts or grits, consisting of finely comminuted chalkdebris of a dirty character. The gruts are generally found along the sides of the Wolddales; but in some places they lie on plateaus. They have beendug out for gravel, and more frequently for mortar, Occasionally these angular chalk gravels are cemented together,forming a breccia of chalk flints which i
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