EESA06H3 Chapter Notes - Chapter 1: Gneiss, Proterozoic, Cenozoic
Document Summary
Uniformitarianism: principle that geologic processes operating at the present are the same processes that operated in the past (the present is the key to the past) uniform rate. Actualism: physical laws are independent of time and location (same meaning as uniformitarianism) Geological time scale: calendar to which events and rock units can be referred: earth was 6,000 years chronology, noah"s flood. James hutton father of modern day geology. Charles lyell principles of geology book geological features could be explained by present-day processes. Numerical age (absolute age): age given in years or some other unit of time. Relative time: sequence in which events took place (not measure in time unites) Principles used to determine relative age: contacts: boundary surface between two different rock types or ages of rocks, formations: bodies of rock of considerable thickness with recognizable characteristics that make each distinguishable from adjacent rock units. Inclusion: fragments included in a host rock are older than the host rock.
