A LOOK AT GEOLOGIC TIME

A LOOK AT GEOLOGIC TIME - ALOOKATGEOLOGICTIME

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

View Full Document Right Arrow Icon
A LOOK AT GEOLOGIC TIME Jan. 1 midnight Earth born 4.6 billion Feb 19                          Oldest rocks known (3.96 billion) March 4                        First organic carbon (3.8 billion) March 28                     First microfossils and stromatolites (bacteria and algae - 3.5 billion) Mid November             First shelled animals in sea (570 million) Dec 1st                        First land plants (400 million) Dec 18  dec 26            Dinosaurs (24566 million Dec. 31st. 8:30 PM       First human creatures (2 million?) 3 seconds ago               Historic time – 1492   There have been five extinction episodes that are agreed upon generally to  qualify as "mass extinctions." Major phylogenetic groups were affected at each extinction pulse: Paleozoic 1. (440 million) -- extinction of marine faunas including trilobites, graptolites, and 
Background image of page 1

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

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

This note was uploaded on 01/27/2012 for the course GEOL 1420 taught by Professor Wagner during the Fall '10 term at Texas State.

Page1 / 2

A LOOK AT GEOLOGIC TIME - ALOOKATGEOLOGICTIME

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