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Group: Mid-Atlantic Geo-Image Collection (M.A.G.I.C.)

Snowball Earth Educational Rock Sample Suite

35b95d4be833ee3a3d02e62488f04a7d

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The Snowball Earth Educational Rock Sample Suite features samples of diamictites and cap carbonates from Namibia, East Greenland, and Canada's Mackenzie Mountains.

The suite comes courtesy of Paul Hoffman, Harvard University; Eugene Domack, Hamilton College; and Timothy Fox, Hamilton College.

For more information on the Snowball Earth Educational Rock Sample Suite, visit www.snowballearth.org/samples.html Will open in a new tab or window .

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Robin Rohrback-Schiavone
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Dated added
November 18, 2012
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geology, macro, nature
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  1. The contact between the metasedimentary Fauquier Formation (uppermost marble member) and the overlying metavolcanic Catoctin Formation is exposed in an abandoned quarry north of Aldie, Virginia, across Goose Creek from Lime Kiln Road. The nature of this contact (is it conformable? does it show primary or tectonic struc...

  2. The contact between the metasedimentary Fauquier Formation (uppermost marble member) and the overlying metavolcanic Catoctin Formation is exposed in an abandoned quarry north of Aldie, Virginia, across Goose Creek from Lime Kiln Road. The nature of this contact (is it conformable? does it show primary or tectonic struc...

  3. The contact between the metasedimentary Fauquier Formation (uppermost marble member) and the overlying metavolcanic Catoctin Formation is exposed in an abandoned quarry north of Aldie, Virginia, across Goose Creek from Lime Kiln Road. The nature of this contact (is it conformable? does it show primary or tectonic struc...

  4. The contact between the metasedimentary Fauquier Formation (uppermost marble member) and the overlying metavolcanic Catoctin Formation is exposed in an abandoned quarry north of Aldie, Virginia, across Goose Creek from Lime Kiln Road. The nature of this contact (is it conformable? does it show primary or tectonic struc...

  5. Sample P101A, from the Ravensthroat Formation in northwest Canada, is a laminated peloidal cap dolostone. The graded and reverse-graded peloids exhibit low-angle cross laminations easily visible to the naked eye. Peloid deposition reflects conditions in which calcium carbonate precipitation is occuring rapidly and has ...

  6. D-6 is a massive gray clast-rich basal tillite (diamictite) from the Storeelv glacial unit of the Ulveso Formation in eastern Greenland. The matrix is primarily composed of coarse sand. Within the sample, clast sizes range from <1 mm to 1 cm. Clast composition and size are similar to east Greenland sample #29, although...

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  7. Sample 17 is a striated and faceted stone embedded in a sandy diamictite matrix. The erosional surfaces of the pebble suggest that it was in direct contact with mobile basal ice. The flattened (faceted) surfaces of the pebble were formed as the pebble scraped along the bedrock beneath the moving basal ice. The striatio...

  8. East Greenland #22 is a finely laminated buff yellow cherty carbonate mudstone (dolostone). This sample was taken from the unit that directly overlies the Storeelv formation glacial deposits. The sharpness of the contact between the Storeelv glacial succession and the overlying cap carbonate implies a rapid transition ...

  9. Cross-laminated sandstone composed primarily of well-rounded, coarse sand grains from the base of the Ulveso Formation. The Ulveso Formation has been interpreted as an immature aeolian deposit with a proglacial subaerial origin. This sample may have been deposited during a period of dry, windy conditions preceding the ...

  10. Massive clast-rich ferruginous diamictite from the Storeelv Formtion in East Greenland. The clasts are of similar composition to those in East Greenland sample D-6, but the matrix in 29 is rich in fine-grained terriginous minerals that give this basal tillite its ferrginous color. Sample is 8.5 cm across at its wi...

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