1. Looking at your graph and the Geologic Time Scale on page 357, during what Period did this rock form? What is the age span of the rock, in millions of years?

http://ocas.pearsonschool.com/ph/cd/0-13-362755-1/iText/phs_hs_earth_main.html?chapter=null&page=356&anchory=null&token=53616c7465645f5fbf38333e581a9d39651d2bb13b72c431e93e7675f5aad2bc2208d27f15e6bb1525d33e130db3f69d3da2c80212744927

here is the link for the text book

Question

1.	Looking at your graph and the Geologic Time Scale on page 357, during what Period did this rock form?  What is the age span of the rock, in millions of years?

http://ocas.pearsonschool.com/ph/cd/0-13-362755-1/iText/phs_hs_earth_main.html?chapter=null&page=356&anchory=null&token=53616c7465645f5fbf38333e581a9d39651d2bb13b72c431e93e7675f5aad2bc2208d27f15e6bb1525d33e130db3f69d3da2c80212744927

here is the link for the text book