306 Mr. Warburton o» Shell-Mark. 



the estate of Mr. Cleghorn, about four miles south of St. Andrew's. 

 This bed is found in a piece of swampy ground, at the bottom of 

 a natural hollow, in attempting to drain which the marie was dis- 

 covered. It is entirely covered by moss, and also rests upon moss, 

 of which a specimen, taken from beneath the marie, accompanies 

 the shells. In the middle of this hollow the marie is five feet thick. 



Logie lies in the parish of Kerrymuir, between Glamis and For- 

 far. The following succession of beds has been discovered on cut- 

 ting trenches for obtaining the peat mosses. Moss, containing 

 trees, from four to six feet thick ; shell marie, from six to seven 

 feet ; blue clay ; shell marie, nine inches thick ; gravel or quick 

 sand, and sometimes a third bed of marie. 



These beds of marie are continuous, and extend over many acres; 

 they are thickest in the middle, and become gradually thinner to- 

 wards the edges of the bogs. 



The marie of Logie, as well as that from Fifeshire above de- 

 scribed, consists almost entirely of the shells of the Helix putris, 

 such as are the specimens presented : myriads of this species are 

 now found living in the brooks that flow through the bogs of 

 Logie. Living specimens of the Mytilus cygneus, equal in dimen- 

 sions to those mentioned by Montagu, and occasionally containing 

 fine pearls, are found in the same brooks : of this shell the marie 

 also contains fragments. 



Not far from Logie, in the parish of Forfar, are the moss and 

 loch of Resteneth, which about the year 1794 were entirely 

 drained by a cut made into the loch of Rescobie, lying at the dis- 

 tance of half a mile on a lower level. Both the moss and loch 

 contain shell marie : that in the moss is covered to the depth of 

 five or six feet by fine black peat, that in the loch not unfrequently 

 so. The marie does not lie in a horizontal bed, but shelves from 



