many small irregularities from 6 to 8" deep, averaging 1 to 3" deep. At the con- tact the old shales have been changed for from 1 to 4" into a green shale due to the percolating action of the sandstone. A good view of the underside of the sandstone shows a decided humpy crescently ridged caracter = the old plucked surface on which the lead spread. The lower 2 feet of the sandstone is covered with hori- zontal circular holes less than 1/4 inch in diameter. They are undoubtedly marine worm channels, and remind of Sedgwick's tubes but are not vertical as they are in this genus. Just around the bend of the trolley line is another fine contact exposure. Here can be seen irregularities - a round of shale probably 30 inches deep over which the sandstone has formed. This is the feature irregularity of the contact seen. As a rule the contact is abrupt and vertical.