352 Curvatures in Transition Slate. * ^ Note H.—(Page 150.) Very ftriking curvatures fometimes occur in Tranfition or Grey-wacke ilate. The wav ed and concentric circular appearances, are the effects of cryftallifation, as is fhewn by the identi ty of thofe kinds of ftrufture with that of gra nite and other rocks univerfally admitted to have been formed from a ftate offolution. Other curved ' and angular appearances feem to be connedted with the mode of depofition of the ftrata, and may be traced either to inequalities of the fun damental rock, or to the irregularities in the de pofition of the ftrata themfelves. In fome rare cafes, the finking of fubjacent ftrata, appears to have produced irregularity in the fuperincumbent. Note I.—(P. 15^0 The variety of Sandftone, mentioned in this page under the name of Conglomerate, is by fome au- • thors denominated Breccia, by others, Pudding- ftone. The name Puddingftone, however, ftriftly fpeaking, can be applied only to that particular rock found in England, and known by the name of the Puddingftone Rock, and which is very dif ferent from Conglomerate, not only in its indivi dual chara&ers, but alfo in its geognoftic fituation. Note K.—(P. 169.) It muft not be underftood, that all limeftone caves are formed in the manner defcribed in this page, becaufe others appear to be formed by the widening