Mr. James Reid, of the Lugton Lime Works, has kindly called my attention to a large surface of glaciated limestone at Lugton, of which he has presented some fine slabs to the University collections. As the striation is of exceptional perfection, and several of its features clearly show the direction of the ice movement at this locality, its evidence seems worthy of record. Lugton is a station twelve miles to the south-east of Glasgow, in northern Ayrshire. It is in the valley of the Lugton Water, which flows south-westward along a band of the Lower Carboniferous Limestone series, let down by trough-faulting between hills formed of porphyrites belonging to the Calciferous Sandstone series. The glaciated surface occurs in a limestone quarry, about 200 yards south-west from the railway station, and on the right bank of Lugton Water. Its altitude is about 376 feet above sea-level. Lugton Water rises 3 miles to the north-east, a little above Loch Libo, which is practically its source. The Lugton valley is followed by the Glasgow & South-Western Railway line to a pass, at the level of a little over 400 feet, by which it crosses to the valley of the Cowdon Burn, a tributary of the Cart; and it thus descends to Neilston and Barrhead. The Lugton Limestones contain a rich fauna of corals, brachiopods, and fish remains, which indicates that the beds belong to the Lower Limestone series. 1. The Striation and Glacial Grooves The glaciated surface is on the This 250-word extract was created in the absence of an abstract