Fresh contribution to our knowledge of the character and the relationship of the upper Paleozoic and Mesozoic formations of Tasmania with the associated Diabasic rocks.

The relations of the lower marine beds to the diabasic greenstone between Passage Point and Long Bay show that the greater mass of the greenstone, as also shown by the recent bore test at the Cascades, is older than the overlying mudstones which quietly repose upon it. In one section, however, opposite Half-moon Bay, both the older greenstone and the mudstones are penetrated by an intrusive sheet of greenstone of later date.