Cretaceous geology

geological signature, usually a thin band of rock, marking the transition from the end of the Cretaceous Period and the beginning of the Paleogene Period, dated with radiometric methods, at the age of 66.043 ± 0.011 Ma

geographical object

ancient tectonic plate, which was subducted beneath the Okhotsk Plate

ancient tectonic plate that existed during the mid-Cretaceous through early Cenozoic time; the remainder of the plate is now located east of the Drake Passage/Shackleton Fracture Zone

ancient tectonic plate that fused onto the Antarctic Plate

ancient oceanic plate that began subducting under the west-coast of North America around the early Cretaceous time