

Sandstone in the County of Forfar. US 



the great mass of conglomerate, which, in Scotland stretches 

 along the foot of the Grampians, from sea to sea. 



In this conglomerate, which may probably be regarded as 

 the lowest member of the old red sandstone formation, are 

 found imbedded numerous masses of the above mentioned 

 slaty sandstone and shale, and it follows, from the above facts, 

 that the latter occupy, in Forfarshire and Kincardineshire, 

 the same place in the series, as the strata of the red sand- 

 stone and shale, so exactly resembling them in character, 

 which, in Gloucestershire, are inter-stratified with the traiv 

 sition limestone. 



No organic remains, however, have hitherto been discovered 

 in these lower sandstones in Forfarshire, Perthshire, and 

 Kincardineshire, by which they might be identified with the 

 red sandstone, containing trilobites, and the fossils of the 

 transition limestone in Gloucestershire and Herefordshire. 



Although I cannot enter fully at present into a discussion 

 of this question, I must here remark, that, after examining the 

 slaty red sandstone, containing trilobites, in Gloucestershire, 

 which is beneath the old red sandstone, as well as the accom- 

 panying porphyries and trap rocks, I have satisfied myself 

 that a strong analogy exists between them and the inferior 

 sandstone and trap rocks of Forfarshire ; but it is impossible 

 to convey in words to others the identity which may at once 

 be recognized in their general aspect. 



I shall content myself, therefore, by stating, that these 

 strata of shistose, red, and grey sandstone, shale, conglomer- 

 ate, &c. in Forfarshire, succeed immediately the clay- slate and 

 greywacke, and repose upon them. They will be classed by 

 some geologists with the greywacke ; others will regard them 

 as the inferior member of the old red sandstone. But if, at 

 length, organic remains shall be discovered in them, they may 

 perhaps be referred, like the inferior red sandstone of Glou- 

 cestershire and Herefordshire, to the transition limestone se- 

 ries of the English geologists. * 



• Mr Weaver has lately informed trie tliat, on the coast of Waterford, be- 

 tween Dungarvan and Tranmore, strata of red and grey micaceous sandy 

 elate, associated with similar quartzose, conglomerates and trap rocks, 

 abound, and they occupy a similar position above the clay-slate. Although, 



VOL. III. NO. I. JULY 1825. H 



