Supplemental material: The Earth Has a Future
journal contributionposted on 01.05.2006, 00:00 by Steven Ian Dutch
Geosphere, May 2006, v. 2, p. 113-124, doi: 10.1130/GES00012.1. Animation 7 - Long-term interplay of deformation, uplift, and erosion in a typical area of active uplift: the Berkeley Hills, California. The first frame is an index map to the cross-section area; the second frame shows the cross-section area in detail. A and B are the topographic profiles used in the cross sections. Ca-24 is California Highway 24, and BART is the Bay Area Rapid Transit line. The present-day cross section is that of Rogers and Peck (2000), which is based on subsurface data from the BART tunnel. The remainder of the animation shows schematic evolution of the Siesta Valley Syncline from 8 Ma to the present, looking northwest along the axis. Profile A is in the distance, and B in the foreground, and they are shown on all frames for reference. From oldest to youngest, the Claremont Formation is brown, the Orinda Conglomerate is dark green, the Moraga Volcanics are purple with intercalated sedimentary rocks in yellow, the Siesta Formation (nonmarine siltstone and clay) is light blue, and the Bald Peak Basalt is gray. The initial section was constructed with the top of the nonmarine Siesta Formation slightly above paleo–sea level, and uplift, erosion, and folding were approximately linearly adjusted to achieve the present structure and topographic profiles. Beginning at 3 Ma, the cross section shows the incision of the Siesta Valley separately from the slower erosion of the resistant Bald Peak Basalt. File size is 0.6 MB. Note: These are animated .gif files. If the animations are appearing as static images, try viewing them with a movie player.