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Current Telychian GSSP is arrowed parallel to the bedding. Credit: Jeremy R. Davies, Richard A. Waters, Stewart G. Molyneux, Mark Williams, Jan A. Zalasiewicz, Thijs R. A. Vandenbroucke & Jacques Verniers.

Paleozoic geochronology is an article and a lecture from the school of geology.

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1 True or False, Ammonite zone duration estimates are made by counting the interpreted precession cycles.


2 Geochronology is the science of applying dates in the past to?

3 Yes or No, The Mesozoic is a younger period than the Paleozoic.


4 The Palaeozoic, Mesozoic and Cenozoic are eras of the?


5 Complete the text:

Match up the geological time unit with the title:
Holocene - A
Gelasian - B
Paleogene - C
Triassic - D
Devonian - E
Archean - F
Precambrian - G
period of the Mesozoic





period of the Paleozoic

period of the Cenozoic


6 Orbitally forced cyclicity includes?

Jupiter-Venus conjunctions
chemical and physical proxies from sedimentary rock sequences
palaeoclimatic studies
marine Cenozoic sequences
meteorite impacts from the asteroid belt
spectral analysis of the magnetic susceptibility (MS) record

7 The GSSP section in Drum Mountains, Utah, USA contains?

one main feature that allows for a direct correlation of this marine section with other marine sections
the base of the Drumian Stage
the base GSSP for the Lower Ordovician
the base GSSP for the Middle Cambrian
the top GSSP for the Cambrian Stage 5
the Ir anomaly at the base of the Boundary Clay
the base GSSP for the Cambrian

8 Which of the following is out of reverse geochronological order?

Lower Ordovician
Middle Cambrian
Stage 3

9 What phenomena may be associated with PreЄ/Є boundary?

the time and geology dated before the Phanerozoic
the eon (or supereon) and rock formations dated before 541.0±1.0 million years ago
the FAD of Trichophycus pedum is the primary stratigraphic tool for correlation of the base (GSSP) for the Fortunian Stage.
coinciding with the first appearance of the fossils of hard-shelled animals
Cambrian Stage 2

10 Yes or No, Hindeodus parvus is now recognized as the index fossil, occurring in the Zone above the P-T boundary.


11 The end-Permian mass extinction coincided with a rapid temperature rise to exceptionally high values in the Early Triassic that were inimical to life in equatorial latitudes and suppressed ecosystem


12 The Permian/Triassic boundary occurs at 248.2 ± 4.8?


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  1. Tephra layers may be the best geochronometer.

See also

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{{Archaeology resources}}