185 LIMESTONE FAMILY. tion, or are more or less deeply waved, and they are #e- casionally disposed in a concentric manner, like the con centric lamellar concretions of greenstone. Some strata contain angular pieces of stinkstone, which at first sight might be taken for fragments; and even whole beds oc cur, which are composed throughout of angular portions, either connected together by means of clay, or imme diately joined without any basis. These various ap pearances do not seem to have been occasioned by any mechanical force acting upon the strata alter their for mation, but are rather to be viewed as original varieties of structure, which have taken place during the forma tion of the strata. It has been also met with in beds in shell limestone, and in the newer coal formation. Geographic Situation. It occurs in the vicinity of North Berwick in East Lothian, resting on old red sandstone; and in the parish of Kirbean in Galloway. On the Continent, it is a fre quent rock in Thuringia and Mansfcld. Uses. In ancient times, it was used as a medicine in veteri nary practice: at present, it is principally employed as a limestone, and when burnt, allbrds an excellent lime, both for mortar and manure. In some districts, as in Thuringia, it is used as a paving-stone, and also cut into troughs, steps for stairs, door-posts, and other similar purposes. Observations. The names Stinkstone and Swineslone given to this mi neral, arc from the disagreeable odour it emits when pounded or rubbed. Second