Introduction

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Abstract
Very little seems to have been written hitherto on the Ayrshire Drift-beds. Mr. Robert Craig of Beith, Dr. James Geikie, Sir Archibald Geikie, and the present writer, have described at one time or another a few of the sections and beds in the county, but the great bulk of those now about to be detailed have recently been investigated by the author himself. Indeed, there are perhaps few exposures of drift in Ayrshire that I have not personally examined; but, as to have given even a short description of each bed would have more than doubled the length of this paper, I have confined myself to such of them as show either some physical peculiarity, as an exposure of several beds of Boulder-clay intercalated with sand, gravel, &c, or to those which have been found to contain marine shells. Before I began a systematic examination of the Ayrshire drift-beds, I was acquainted with only one or two instances where marine shells occurred in them under Boulder-clay; these were, in the Bennane scaur (see par. 9), where they had been noted by the officers of the Geological Survey, and in the neighbourhood of Kilmaurs. When I had got pretty well over the sections I asked Messrs. A. W. Whyte and F. White, of Muirkirk, both having had much practice in collecting Carboniferous fossils, to devote some of their spare time to the examination of the various drift-beds in that neighbourhood. Both have already got numerous fossils from the beds, mostly from This 250-word extract was created in the absence of an abstract
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