XIV. On a Bed of Ironstone occurring in Trap Tuff, in the Parishes of Stevenston, Dalry, and Kilwinning

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Abstract
In the latter part of 1886 I found a bed of ironstone embedded in trap tuff in a natural exposure on Lugton Water, nearly opposite Montgreenan House, in the parish of Kilwinning. Although I had before passed this section several times I never dreamt that it contained a thick bed of ironstone, weathering having given it the appearance of a decomposing trap. Shortly after finding this ironstone in the Lugton Valley I was able to trace it in the four undernoted localities:— 1. In the first cutting of the Caledonian Railway, south-west of Kilwinning Station, where part of it was laid bare during the progress of the railway works. 2. In the cutting of the same railway to the north-east of Saltcoats. This outcrop is now mostly covered over, but part of the ironstone can still be seen. 3. On the Saltcoats shore, 490 paces south of the mouth of Stanley burn, where part of it is seen outcropping from below a bed of light-coloured tuff or volcanic mudstone which underlies the bottom shales of the Saltcoats coalfield. 4. In the bed of the Dusk Water at Ravenscraig, two miles east-south-east of Dairy. The outcrop in the Lugton Valley is certainly a very typical one, as in a small cliff on the west bank of the stream a full section is exposed, together with the strata both above and below it. The following is the section, which dips at 13° to the south:— The ten-inch coal is the lowest seam This 250-word extract was created in the absence of an abstract

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