S1E6 J15 Plate Tectonics and Alfred Wegener Cretaceous, deep time, geology, m4, plate tectonics, Wegner Listen Junction 15 of the M4 traveling west. This is the third episode from the Cretaceous Period. Audio Playerhttps://www.richardtreves.com/podcast-player/483/s1e6-j15-plate-tectonics-and-alfred-wegener.mp300:0000:0000:00Use Up/Down Arrow keys to increase or decrease volume.