Originally posted by lee_merrill
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The Cambrian Period started roughly 541 million years ago (mya) and lasted approximately 55.6 million years (meaning it ended around 485.4 mya). That would put 518 mya real close to the middle of the Cambrian. Maybe these two timelines will help
Click on an image XXXX
to enbiggenate XXXX
CambrianChart.PNG XX CambrianChart2.jpg
Click on resulting XXXX
image to increase XXXX
enbiggenation XXXX
to enbiggenate XXXX
CambrianChart.PNG XX CambrianChart2.jpg
Click on resulting XXXX
image to increase XXXX
enbiggenation XXXX
Also note that the "Cambrian explosion" took place over a period that lasted at least 20 millions years. This is why folks like the noted geologist and paleontologist Donald R. Prothero as a "slow fuse" rather than an explosion.
ETA: For whatever reason only the first enbiggenates
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