drrockclub: Columnar rhyolite; horizontally!? Here is complete contrast to the classical geological
drrockclub:Columnar rhyolite; horizontally!?Here is complete contrast to the classical geological feature such as a columnar basalt.Columnar basalts are something many people have seen or heard of at somepoint, with spectacular examples in Iceland where perfectly formed verticalhexagonal columns create beautiful natural landscapes that look as if they wereformed by a man with a chisel.However, here are columns which are horizontal and made of rhyolite,which is a rock completely opposite to basalt in terms of its composition andconstancy (when molten that is).So how did it form?The process of column formation for this example would be the same asfor a columnar basalt, which is attributed to large body of lava being pooledin surface depressions and undergoing slow cooling. Horizontal orientation, thisis something that would have occurred after complete cooling of the lava. Byprocess of tectonic forces, this sequence of rocks was tilted, so originallyvertical columns were turned to an approximately horizontal position.Example from remote New South Wales, Australia. -- source link
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