BS110 Homework 2 answers

BS110 Homework 2 answers - Paleozoic Era Permian Period The...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Paleozoic Era Permian Period The Permian Period of 290-240 million years ago marked the last phase of the Paleozoic Era. Earth’s landmass consisted of the giant continent of Pangaea, not yet divided into Gondwana and Laurasia. Though still warm, the climate became cooler and drier as glaciers formed around southern Pangaea and shallow waters receded from the continental shoreline. The Permian ended with a mass extinction that killed off a significant percentage of marine life, including trilobites, and resulted in a proliferation of reptiles like Labidosaurus, Captorhinus, and pelycosaurs; “mammal-like” reptiles that reached their peak in the Permian Period such as Ophiacodon, Dimetrodon, and the herbivorous Edaphosaurus. Also living among these were early amphibians like Diplocaulus and Seymouria. Except for a few herbivores and dominant predators like Dimetrodon and Ophiacodon, few of these animals were very large. Though most of them died out before the Triassic Period that followed, their abundance prevented competition from swaying the evolutionary path that led to the Mesozoic being the “Age of Reptiles.” Mesozoic Era Cretaceous Period
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 2

BS110 Homework 2 answers - Paleozoic Era Permian Period The...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online