https://padlet.com/306024/r5py8dr5ixel en-us 2018-01-16 22:52:34 UTC 2025-10-27 18:26:15 UTC hello@padlet.com 306024 https://padlet.com/306024/r5py8dr5ixel/wish/221912255 . It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.]]> 2018-01-16 22:55:14 UTC https://padlet.com/306024/r5py8dr5ixel/wish/221912255 306024 https://padlet.com/306024/r5py8dr5ixel/wish/221913197 In geology and related fields, a stratum is a layer of sedimentary rock or soil, or igneous rock where formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.]]> 2018-01-16 23:05:03 UTC https://padlet.com/306024/r5py8dr5ixel/wish/221913197