Earth is 4.5 billion years old- what does this mean
Resolution of geologic time—how accurately do we know time in different parts of the past; Our view of time is telescoped with a finer units closer to the present
How do we know/measure geologic time-methods
Absolute/Radiometric Dating
Relative Dating/stratigraphic principles
Cyclostratigraphy
Biostratigraphy
Magnetostratigraphy
Chemostratigraphy
Thresholds/benchmarks in geologic history; big natural changes/ what makes the major divisions in the geologic time scale
Earth has a history and is always changing-
How do we know?
Reading the rock record
Proxies
Nature of rock record- composite nature of rock record (space for time)
How do geoscientists test theories and draw conclusions: what constitutes robustness?
Geoscientific method brings together multiple lines of evidence.