GEOL 488 Quiz 2 Key Dates & Locations

Key dates and locations for GEOL 488 content

Start of Paleoproterozoic

2.5 Ga

Start of Mesoproterozoic/end of Paleoproterozic

1.6 Ga

Age of mesoproterozoic Yavapai-Mazatzal Provinces

1.8 to 1.6 Ga

Location of of mesoproterozoic Yavapai-Mazatzal Provinces

The “four corners” of Utah, Arizona, Colorado, and New Mexico

Start of Neoproterozoic/end of Mesoproterozoic

1.0 Ga

End of Neoproterozoic

0.54 Ga

Age of Keweenawan rift

1.11-1.09 Ga

Location of Keweenawan rift

Southern part of Superior province

Age of Nuna supercontinent

1.5 Ga

Location of Lake Superior region in Mesoproterozoic

Equatorial region

Age of Rigolet pulse (Grenville orogen)

1020-980 Ma

Age of Ottawan pulse (Grenville orogen)

1080-1020 Ma

Age of Elzevirian/Shawinigan pulse (Grenville orogen)

1190-1140 Ma

Age of Grenville orogen’s Pre-Shawinigan ≈ Elzevier phase

1290 – 1190 Ma

Age of Grenville orogen’s Shawinigan phase

1190 – 1140 Ma

Age of Grenville orogen’s Ottawan & Rigolet orogeny

1090 – 980 Ma

Age of Rodinia supercontinent

1.2 Ga to 750 Ma (short-lived)

Age of initiation of the breakup of Rodinia

750 Ma

Age of rifting of North America after Rodinia

ca. 650 Ma

Age of beginning of Paleozoic (Cambrian)/end of Proterozoic

541 Ma

Age of Tippecanoe megasequence

Mid-Ordovician to Early Devonian; (460—400 Ma)

Age of Sauk megasequence

Late Precambrian to mid-Ordovician; (650—460 Ma)

Age of Kaskaskia megasequence

Early Devonian to mid-Carboniferous; (408—320 Ma)

Age of Hirnantian Glaciation

445—444 Ma (during Tippecanoe megasequence)

Age of seafloor spreading (western margin of Laurentia); breakup of Rodinia

750 Ma

Age of superplume initation (western margin of Rodinia); breakup of Rodinia

780 Ma

Age of Antarctica, Australia, and China drift (western margin of Laurentia); breakup of Rodinia

720 Ma

Age of opening of proto-Pacific ocean (W. margin Laurentia) + beginning of continental rifting (E. margin Laurentia); breakup of Rodinia

600 Ma

Age of E. margin of Laurentia breaking free; breakup of Rodinia

550 Ma

Age when Laurentia drifts and Gondwana forms; breakup of Rodinia

530 Ma

Complete age of breakup of Rodinia

550 Myr from 750—550 Ma

Age of Neoproterozoic Snowball Earth

717–635 Ma

Age of Gaskiers glaciation

580 Ma

Age of Marinoan glaciation

635 Ma

Age of Sturtian glaciation

715 Ma

Age of the Cambrian explosion

540-515 Ma

Age of Franklin diabase dykes in N. Canada (initiation of breakup of Rodinia)

719 Ma

Age of Windermere Supergroup

450 Ma

Location of Windermere Supergroup

Northwestern N. America

• Through Mackenzie mountains and Cariboo mountains

Age of Sturtian glacial deposits in NW Canada

718 Ma

Location of Avalon peninsula

Off the coast of eastern Newfoundland

Age of Gaskiers tillite

582 Ma

Age of Mistaken Point fossils

574 Ma → “when life got big”

Location of Mistaken Point

Avalon peninsula, off the coast of E. Newfoundland

Age of Grenville diabase dyke swarm

590 Ma

Age of entire Appalachian orogen

600 to 300 Ma

Age of ophiolite obduction during Taconic orogen (Appalachian orogen)

470 Ma

Acadian orogen age (initiation)

Middle Silurian, ~420 Ma

Age of Catskill clastic wedge

Middle Devonian, ~385 Ma

Age of Thetford mine ophiolite

491 ± 3 Ma

Age of Alleghanian orogeny

320—250 Ma

Age of Michigan and Illinois basins

385 Ma