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Up to 1839 it was assumed on the basis of the crystal structuremetamorphic rocks of the island Anglesi that they are older than all the rocks nearbyof the continent; but it later turned out that these rocks of the same antiquity withshales and sandstones of Carnarvon and Marioneta. To take another example, soas the shale fractures was primarily found in the lower rocks, thenthe symptom of this was considered for specifying the earliest times; this resulted ina serious error, as at present, it appears that the samethe peculiarity of the mineral structure found in the Carboniferous system.Another example: on the basis of lithological species, we present somered conglomerates and sandstones of the North-West coast of Scotland, theirlong believed to belong to the old red Sandstone; meanwhile, accordingthe same lithological appearance it is proved the identity of these speciesfrom the lower Silurian. We brought only a few examples of how littleto be trusted mineral characteristics where it comes to identifyingof antiquity and of the relative position of the layers. Of recently appearedthe third edition of Siluria, you can dial the numerous examples that speak tothe confirmation of our thoughts. Sir R. Murchison thinks positively provenwhat stipanska siliceous rocks of Shropshire perfectly matchtrimedoxime North of Wallis Sands. Judging from the fossil, found inthe shales and limestone near the Ball, these last equal antiquity withkaradagskiy Sandstone, located forty miles from the first place. InRadnorshire formation, part of the classification called topllandovery rocks, is described in different places as"Sandstone or conglomerate," then as "impure limestone", then as "solidrough Sandstone", then as "siliceous Sandstone". It is quitegreat variety for a small space oneCounty.
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