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6), but alternatively there could also have been a passage to a remnant of the Iapetus Ocean.
Iapetus is known to have starkly contrasting hemispheres -- one black as coal, the other white as snow.
57 Ga to form the Iapetus Ocean, and the magmatism at 0.
Another possibility, supported by the appearance of dark material at the bottoms of the moon's craters, is that the dark material has been spewed from the interior of Iapetus.
They provide a significant N-S cross-section that includes the Laurentian margin in the north passing southwards through the South Mayo trough and the Connemara Massif to the Iapetus Suture and onto the Avalonian margin (Klemperer et al.
The Ordovician and Silurian development of the Iapetus Ocean.
The rift-drift event relates to the departure of the peri-Laurentian Dashwoods micro-continent rather than creation of the Iapetus Ocean, which is purported to have opened earlier (Waldron and van Staal, 2001).
According to the above authors, the older, ensimatic Penobscot Arc existed within Iapetus Ocean above a northwest-dipping subduction zone during at least Middle Cambrian to Tremadoc.
Caught on the new ridge's slope, the minicontinent slid into and across the now- extinct Iapetus Ocean.
A 4- or 6-inch adds Iapetus, Rhea, Dione, and (with a little difficulty) Tethys.
In the North American Midcontinent the Late Ordovician estuarine circulation system resulted in an influx of deep, cool, P-rich waters through the Sebree Trough from the Iapetus Ocean to the carbonate platform, causing widespread distribution of phosphorite, phosphatic carbonates and phosphatic discontinuity surfaces (Kolata et al.
Only one other large solar system body, Saturn's moon Iapetus, shows greater brightness fluctuations.
Some of this dust gets swept up by the next moons inward, particularly the leading hemisphere of Iapetus and (probably) all of Hyperion.
The sediments accumulated in a slowly subsiding basin in a tropical setting south of the equator, along the NW margin of the Iapetus Ocean (Petryk 1981; Barnes 1988, 1989; MacNiocall et al.
Before that truly epic event, the land which was to become England and Scotland lay thousands of miles apart on different continents, separated by the Iapetus Ocean which was probably as wide as today's Atlantic.
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