Name ____________________________________________________ Period _______ Code # _________ CHAPTER 5 - INTERPRETING EARTH'S HISTORY PAGES 115 - 140 29. How do you match rock strata in one location with the strata in a different location? 30. Define index fossil. 31. Why would humans make an excellent index fossil? 32. Early geologists noticed that rock formation could often be identified by the fossils they contained and that certain formations were consistently above or below other formation. What did these observations result in? 33. How were these groups named? 34. How is the geologic time scale divided? 35. What does the name Paleozoic, Mesozoic and Cenozoic mean? 36. What does the name Precambrian mean? 37. What type of organisms were found in the Precambrian era? 38. What type of organisms were found in the Paleozoic era? 39. What type of organisms dominated the Mesozoic Era ? 40. What is the Cenozoic Era often referred to as? 41. Define orogeny.