Author: DEAN, W.T.
Title: Trinucleid trilobites from the higher Dufton Shales of the Caradoc Series in the Cross Fell inlier.
Description: 1961. Proc. Yorkshire Geol. Soc. Vol. 33, pt. 2, No. 6; pp. 119-134, 3 plts. h.t. Orig. extract, very good.

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