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Sloss Diagram and Phanerozoic Evolution of North America:
This animation shows the relationship of: (1) the geologic evolution of North America from the latest Precambrian (600 Ma) to the Present (right), and (2) the distribution of the six major stratigraphic sequences in time and space for North America, as defined by Larry Sloss (1963) (left).
On the chart, the vertical axis shows geologic time (from 600 million years (base) to the Present). The horizontal scale is in distance and indicates where sedimentation was occurring on the North American continent. The orientation of the diagram is roughly east (right side) to west (left side). The orange areas in the central part of the chart show where no sediments were deposited (i.e. hiatus). The white area indicates where sediments were being deposited (various shades of blue on the map). The purple triangles on the left and right side of the diagram indicate the timing major orogenies (times of mountain building). The horizontal red line indicates the geologic time being shown on the chart and matches the geologic time shown on the map.
The video demonstrates four concepts:
(1) the movement of geologic plates through time;
(2) the movements of the oceans through time,
(3) how North America has been repeatedly below and above sea level during its geologic history,
(4) the distribution of Sloss sequences and how they are related to the paleo-geographic map view.
The maps are courtesy of and reproduced with the permission of Professor Ron Blakey, Colorado Plateau Geosystems (cpgeosystems.com). Video is created by Jay Austin, Kris Schwendeman, and Paul Weimer. Interactive Geology Project, University of Colorado-Boulder. igp.colorado.edu
Source: vimeo.com/8425...
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