Late Cenozoic Geology Neogene Period/Pleistocene Epoch Defining the Pleistocene: Lyell: 90-100% extant molluscs Presence of glaciation (*Miocene) 1.6-10,000.

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Presentation transcript:

Late Cenozoic Geology Neogene Period/Pleistocene Epoch Defining the Pleistocene: Lyell: % extant molluscs Presence of glaciation (*Miocene) ,000 y.b.p.

Evidence of Glaciation The phenomenon had to be proven! Louis Agassiz, James Hutton Hutton’s native Scotland

Physical characteristics of glacial sediments drift/till: texturally & mineralogically immature fossil till = tillite Permian, Gondwana Pleistocene till Proterozoic Gowganda Fm., Canada

outwash: well-sorted, stratified, but associated with till

Glacial landforms: U-shaped valleys, cirques, horns, aretes (alpine) Moraines, drumlins, eskers, outwash plains, poor drainage (continental)

Geologic Record of Glaciations Cenozoic (0-20 mybp; Miocene-Pleistocene) Late Paleozoic ( mybp) Gondwana Siluro-Devonian (S. America) Ordovician (North Africa) Ediacarian (700 mybp)-Snowball Earth?? Late Archean/Early Proterozoic ( bybp) Gowganda Fm., Canada

Causes of Glaciation Explanations must account for: relative rarity of this phenomenon alternating glacial/interglacial episodes (cyclicity)

Precession of Earth’s orbit I. Astronomical hypotheses (Milankovitch) Tilt of Earth’s axis Eccentricity (shape of Earth’s orbit)

II. Atmospheric Hypotheses Carbon dioxide greenhouse effect “Impact winter” dust cloud from impact/volcanism III. Oceanic circulation IV. Plate tectonics Ultimate control? Combination of astronomical parameters and position of plates?

North American Glacial centers Ohio River is southern extent

Pleistocene history of the Great Lakes Note: 4 glacial advances is probably an oversimplification! There are 16 recorded in Europe for the same time interval!

Glacial moraines dominate Great Lakes region topography Compare glacial (surficial) map of Michigan to bedrock map:

Rise and Fall of the Great Lakes (themes in the movie) Glacial/interglacials Effects of a mile-thick glacier: subsidence/rebound changes to drainage Great Lakes carved out along pre-glacial drainage Glacial features: Scoured bedrock Erratics Drumlins Human impact (Lake Erie then & now)

Proglacial, e.g., Lake Agassiz Pluvial, e.g., Lake Bonneville (ancient Salt Lake) Other North American Glacial Phenomena: large fossil lakes

“Scablands” flood from release of glacial Lake Missoula

The importance of moraines

pubs.usgs.gov/gip/ capecod/glacial.html

Biological Effects of ice ages….