SILL, in geology, an intrusive mass of igneous rock which consolidated beneath the surface and has a large horizontal extent in comparison with its thickness.
The rocks in which it lies belong to the Carboniferous Limestone series, and the Sill is probably one of the manifestations of the volcanic activity which occurred during the later part of the carboniferous period.
These sills are harder and more resistant than the tuffs and vesicular lavas, and on the hill slopes their presence is often indicated by small vertical steps, while on the cliff faces their columnar jointing is often very conspicuous.
Sills, Beverly (1929-2007), American soprano, who combined critical success with international popularity as a result of her clear, supple...
In geology, a sill is a tabular, often horizontal mass of igneous rock that has been intruded laterally between older layers of sedimentary rock, beds of volcanic lava or tuff, or even along the...
The site of Fort Sill was staked out on January 8, 1869 by Maj. Gen.
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