Blogged at the CCA weblog on Tuesday is a link to a fantastic project undertaken by Dr. Ron Blakey.The maps created by Dr. Blakey represent time slices of the geologic transformations, via plate tectonics, to the core of ancient
The projects website contains 40 of the most representative time slices. From these maps you can witness how the physiography of Laurentia has changed through geologic history. Mountains rise, rifts open, deserts form, and lakes deepen as the earth's tectonic plates subside and become reborn.
Of particular interest to me is the time slice of Late Triassic (210Ma).
Along the Eastern Seaboard of the
For the next few million years, the lake shallowed and the mountains eroded. As pressure was release, the Earth thrust magma into near surface chambers and lava outflows. Into the Cretaceous and Tertiary periods of the past 150 million years, the regal mountains which once supplied the Triassic lake with sediment are eroded to reflections of their former selves. The sediments of the
Since I am no geologist, understand that this description may be a bit fictitious, but it is the way I like to see it.
Head on over to the CAA blog to read some more, or to read another rendition of the geologic history of Laurentia, based on these maps, check out the BLDGBLOG.
(Pictures are credited to Dr. Ron Blakey. Fantastic work!)