olaya, in great abundance. Fragments are occasionally abundant. The contact between the Medina and Cataract is as sharp as can be. The Cataract ends in fine shales green for 6 to 78 inches and then [illegible] [illegible] below. About 4 feet beneath the contact come in the red Phacencian bygone beds, see photograph. At the bend of Dartmouth street mediine railway plane are on the known contact of the Clinton. The Medina then bedded granitic sandstones and shales one supposed along the steps but a short dis- tance down. The Clinton comes in abrupt line during a sandy pyritiferous glauconitic basal layer 1/2 to two inches thick a deep. The sand then becomes less, the glauconite and pyrite continue into the limestone (more magnesian), and of about 15 inches or better seems Permianus Magnesia Medina shale inclusions if any are scarce. The sharp and diverse lithologic contact with the difference in forms make this contact a brittle one.