Table Rock
Table Rock is an erosional remnant of a tuff cone, which at present is a symmetrical cone about 5,020 feet (1,530 m) in diameter at the base, tapering to a diameter of about 1,180 feet (360 m) at a height of 1,180 feet (360 m) above the surrounding plain. The cone is capped with flat-lying basalt which once filled the crater, but erosion has modified the original cone, exposing the once ponded basalt lava lake. Dikes extend north and south of the crater's lava lake. On the lower flanks of the cone, the rocks are mostly palagonite lapilli-tuff. Near the summit, the uppermost palagonites are overlain by massive cinders and bombs from fire-fountaining that preceded the filling of the crater with lava.
Read more about this topic: Fort Rock Basin
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