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The fluvial sediments in the top of Silurian Tushibulake Formation was the first occurrence of Paleozoic continental strata��which suggested that there was a great sea regression happened during Silurian in Kuruktag of northeastern Tarim Basin��and the environment changed from shore-shallow marine to continental impact�� The upward-coarsening sedimentary succession reflected the fast filling of Tarim Basin�� The angular unconformity in a large area on the top of Silurian��the filling characteristics changed from marine to continental facies��the provenance background of foreland uplift and volcanic arc orogen revealed the compressional tectonic background of the basin�� The uplifted northern margin of Kurugtag and the volcanic arc orogen were the provenances of the Silurian basin in Kurugtag�� This Silurian regression in Kuruktag happened under the background of the basinward uplifting�� The Silurian basin developed on the basis of Sinian-Ordovician basin��which related to the closing of NantianshanOcean from east to west and the clockwise rotation of Tarim Plate�� The development and ending of the Silurian basin
in this area represented the ending of a basin forming cycle from Sinian-Silurian-Devonian under the situations from
extension to compression��