During the subsequent Cretaceous Period (144 to 66 Ma ago) the entire Pacific coast of North America, from Alaska to Central America, was a subduction zone. The Farallon plate is notable for having been very large, and for subducting nearly horizontally under much of the United States and Mexico; it is likely connected with the Laramide Orogeny. About 85 Ma ago the part of the Farallon plate from approximately California to the Gulf of Alaska separated to form the Kula Plate. The period 48–50 Ma (mid-Eocene) is especially interesting as this is when the subducted Kula—Farallon spreading ridge passed below what is now the OWL. (The Burke Museum has some nice diagrams of this.) This also marks the onset of the Oregon rotation, possibly with rifting along the OWL, and the initiation of the Queen Charlotte and Straight Creek Faults. The timing seems significant, but how all of these might be connected is unknown. Around 30 Ma ago part of the spreading center between the Farallon Plate and Pacific Plate was subducted under California, putting the Pacific plate into direct contact with the North American plate and creating the San Andreas Fault. The remainder of the Farallon Plate split, with the part to the north becoming the Juan de Fuca Plate; parts of this subsequently broke off to form the Gorda Plate and Explorer Plate. By this time the last of the Kula Plate had been subducted, initiating the Queen Charlotte transform fault on the coast of British Columbia; coastal subduction has been reduced to just the Cascadia Subduction Zone under Oregon and Washington. The Newberry Hotspot Track – a series of volcanic domes and lava flows closely coincident with the Brothers Fault Zone (BFZ) – is of interest because it is parallel to the OWL. Unlike anything on the OWL, these lava flows can be dated, and they show a westward age progression from an origin at the McDermitt Caldera on the Oregon-Nevada border to the Newberry Volcano. Curiously, the Yellowstone hotspot also appears to have originated in the vicinity of the McDermitt Caldera, and is generally considered to be closely associated with the Newberry magmatism. But while the track of the Yellowstone hotspot across the Snake River Plain conforms to what is expected from the motion of the North American Plate across some sort of "hotspot" fixed in the underlying mantle, the Newberry "hotspot" track is oblique to the motion of the North American Plate; this is inconsistent with the hotspot model.