Here is an animation of the paleaogeographic reconstruction of the Earth, beginning from the Cambrian period through to the present day (arthur: EarlyCambrianGlobal.jpg: Dr. Ron Blakey). I love this animation!
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Rock of the week
Diorite – An intermediate intrusive igneous rock and usually contains; feldspar, hornblende, biotite, pyroxene and sometimes quartz, olivine and other accessory minerals. Diorite principly occurs where there is partial-melting of mafic rock above a subduction zone. Commonly diorite is found in a volcanic arc setting and in mountain building areas such as the Andes. Diorite is a relatively rare rock and is very hard.
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