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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.