ANALYSES OF SANDSTONES FROM THE MILLSTONE GRITS AT YEADON, YORKSHIRE

Abstract

The sandstones referred to in this paper were obtained from a boring sunk during 1935 for the Yeadon Waterworks Company at Yeadon, 8 miles north-west of Leeds. The log of the boring has been published by Mr. Edwards, M.A. who has discussed the main points of stratigraphical and palaeontological interest.1 The present paper describes certain petrological aspects of the main sandstone bands. The specimens were kindly supplied by Mr. Edwards. I. Sandstones Investigated. The boring passed through 649 ft. of the Millstone Grits, including the main part of the Middle Grits and the top 100 ft. of the Kinderscout Grit. The recognition of standard marine bands permitted direct comparison with other areas and the following sandstone beds were identified—Guiseley Grit, East Carlton Grit, and Kinderscout Grit. Thirteen specimens were supplied as follows :— | Middle Grits{ | Guiseley Grit | .. | Specimens 1—6. | || | East Carlton Grit | .. | Specimens 7 and 8. | | Kinderscout Grit | .. | .. | Specimens 9—13. | The actual depth of each specimen in the boring is stated in Fig. 1. II. Mechanical Composition. The work done on the sedimentary petrography of the Carboniferous rocks of the Pennine area has made it clear that in such studies mechanical composition and mineral composition are to a certain degree related, and any expression of mineral composition without an accompanying statement of mechanical composition loses much of its value. Certainly this is the case if one is attempting that detailed quantitative study upon which future heavy mineral work must be based. For this ...