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

Snowball Earth Educational Rock Sample Suite

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23 GigaPansViews

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 .

Created by
Robin Rohrback-Schiavone
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0.409484 gigapixels
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159
Dated added
November 18, 2012
Categories
geology, macro, nature
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  1. Massive clast-poor diamictite from the Ulveso Formation in east Greenland. The sandy deposits in this otherwise massively bedded sample are interpreted as meltwater-washed horizons deposited in a fluctuating subglacial environment. The sandy horizon was probably originally deposited in cavities exposed by melting basal...

  2. Fine-grained carbonate laminite from the Rhastoff Formation carbonates overlying Sturtian sediments in Namibia. Sample's longest dimension is 9.7 cm. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene Domack, Hamilton College; and T...

  3. A massive clast-rich diamictite interpeted as a basal tillite deposited in direct contact with glacial ice. From the middle member of the Ghaub Formation in Namibia. Sample is 13 cm across at its widest point. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman...

  4. Pseudomorphosed aragonite crystal fans in calcimicrite from the Hayhook Formation. PFH-3 is an aragonite crystal fan from the Mackenzie Mountains in northwest Canada. The aragonite has been partially replaced by dolomite and calcite minerals. The sample records several intervals of fan growth and truncation, and is ...

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  5. A fine-grained carbonate laminite from above the Ghuab glacial formation. It is interpreted as a marine cap carbonate suggestive of rapid enviromental change. Sample is 8.4 cm long. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene...

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  6. Carbonate mudstone with calcitic dropstone from the lower member of the Ghaub Formation in Namibia. This rock records the onset of Marinoan glaciation, represented by dropstones in the Ghaub Formation. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard U...

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  7. From the Amogjar cap dolostone in West Africa. This barite fan records barium sulfate remobilization that occurred during a rapid shift in oceanic chemical conditions. Barium sulfate is insoluble in oxygenated water, but under anoxic conditions it will dissolve in the manner seen here. PFH-1 records unusual oceanic ...

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  8. Seafloor barite in cap dolostone in upper Ravensthroat Formation from northwest Canada. Sample is 50 mm across at its widest point and 15 mm across at its narrowest point. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene Domack, H...

  9. Banded iron formation with ice-rafted debris. This deep ocean stratigraphic equivalent of Ghaub diamictites indicates highly anoxic oceanic chemistry. The grey is hematite, the red is jasper, and the buff is siderite. The sample is from the Mackenzie Mountains in northwest Canada. Banded iron deposition requires tha...

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  10. Jay Kaufman of the University of Maryland - College Park loaned us this sample to image. It is a piece of the Ghaub Formation of Namibia, carbonate diamictite with iceberg-rafted debris attributed to the Neoproterozoic "Snowball Earth" glaciation. A prominent dropstone is located in the middle of this face. Sampl...

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