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NCTS HG Vocab

Historical Geology Vocabulary

QuestionAnswer
Geological Time Scale (GTS Divisions in time that show Earth’s past
Geological Time Scale (GTS Broken down into EONS, ERAS, and PERIODS
Eon The largest time unit on the GTS. (ex. Phanerozoic)
Era A major division on the GTS that is a subdivision of an EON. (ex. Paleozoic, Mesozoic, Cenozoic)
Period A basic unit of time on the GTS that is a subdivision of an ERA. (ex. Cambrian, Jurassic)
Radioactive (radiometric) Dating The complex procedure that determines a rock or fossil’s ABSOLUTE AGE (exact age); uses IGNEOUS ROCKS.
Relative Dating A form of dating rocks and fossils that places them in their PROPER SEQUENCE.
Relative Dating Can use SEDIMENTARY rock layers to help determine sequence (RELATIVE AGE)
Law of Superposition Sedimentary layers are deposited in a time sequence, with the oldest on the bottom and the youngest on the top (helps with relative dating)
Phanerozoic Eon The part of geologic time that is represented by rocks with an abundance of fossils
Phanerozoic Eon Follows the Precambrian Time
Gondwana & Pangea Proposed supercontinents where all landmasses were connected (during Ordovician and Permian Period, respectively)
Glaciation The primary reason for the rise in sea levels and the burst of marine invertebrates during the Cambrian period.
Fossil The preserved remains or traces of an organism
Created by: dsteffey
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