Learn about the time period that took place 251 to 199 million ... By the start of the Triassic, all the Earth's landmasses had coalesced to form Pangaea, a supercontinent shaped like a giant ...

All three of orbital cycles — called Milankovitch ... Model, proxy and isotopic perspectives on the East African Humid Period. Earth and Planetary Science Letters 307, 103-112 (2011).

During this period, the parts of the Earth classified as drylands expanded ... broad swaths of southern Africa and all of the Mediterranean. “Unlike droughts—temporary periods of low rainfall ...