"Medina occurs one foot of eraser, light-green sandstone that is once n less eros filled. It is about 15 feet thick. Upwards it passes into 5 feet of thin redclad sandstones of the same character as below but with shale partings. The sandstone at the contact is a dirty sandy mud with some pgsite. In a half inch it changes into a clearer sand and here the worm borings begin. In the basal one inch of the sandstone saw one piece of the lower red shales included in the sandstone. Therefore an old land surface washed clean by the invading sea. The dark-headed basal sandstone rests sharply on the eroded shale of the Queenstown without the least sign of transition gone. In an exposure 400 feet long (about 2 miles below Paulford) the contact shows very broad undulations that seem not to be more 18 inches deep. The detail however shows