thick. On one of the first dates, about 1/2 mile east of the end of the structure line. Here the contact between the cement beds and the regulation Archeton comes out very clear and reveals a very irregular contact, the most marked one seen. The Archeton is very irregular at the top with differences of three feet and one is hardly over in doubt as to what is Archeton, being the regulation thin lidded blue shale. On the top of this irregular surface sets the cement beds I found channeled balls and irregular deposits. All are here disposed to lay the contact here although at friendly gestures are laid the contact at the crystalline limestone line above. Below this lower contact line one has also cement beds (an illustration) so that after all the lower contact is no better than the upper one. In general one can say that the whole conditions may be passing into deeper crusts and that it is this deepening that brings on strong eruptions and then the