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[[folded, lined paper]] Section Tully Limestone [[IMAGE: lines drawn in blue pencil, indicating 4 strata, and named as follows]] Calciferous Argillite. Argillaceous Limestone. solid Limestone with thin seams of Argillite - = Thin seam of Argillaceous Limestone - There are several fossiliferous Strata of these Limestones but, to make them available, they need a long exposure to the influences of varying temperature and moisture. Some of the Argillites easily yield fossils. Hence, from this Limestone in situ it is almost impossible to obtain a single fossil. From loose fragments, any amount may be obtained. In order to determine the horizon of a fossil, it is necessary to study closely the Lithology of the rocks in situ, and then compare the loose fragments.