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- noun Plural form of
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Forfarshire placed in its middle, and the Holoptychius beds of Scot-Crag and Clashbinnie on its upper horizon; but since that time the tilestones have been transferred to the Upper Silurian division of rocks, and the evidence furnished by their supposed Dipterus has not been confirmed.
This formation of the gray tilestones has furnished one vegetable organism apparently higher in the scale than those just described, in a well marked
It must, however, be stated, on the other hand, that the crustaceans of the gray tilestones of Forfar and Kincardine not a little resemble those of the Upper Silurian and red tilestone beds of England; and that, judging from the ichthyodorulites found in both, their fishes must have been at least generically allied.
And such are some of the considerations that still lead me, notwithstanding the failure of previous evidence, to hold, at least, provisionally, that our Scottish flagstones to the north of the Grampians occupy a lower horizon than our Scottish tilestones to the south.
[It has been questioned whether the lower place in the Old Red System should be assigned to the flagstones of Caithness and Ross, with their characteristic Dipterus and Coccosteus beds, or to the gray tilestones of Forfar and Kincardineshires, with their equally characteristic