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Gigapans

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  1. 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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  2. 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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  3. 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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  4. 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...

  5. 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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  6. Stratified carbonate diacmictite with sediment gravity flow and ice-rafted debris. Sample is 15 cm across at its widest point. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene Domack, Hamilton College; and Timothy Fox, Hamilton Co...

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  7. Stratified carbonate mud diamictite with sediment gravity (debris flow) deposits and ice-rafted debris from the upper member of the Ghaub Formation in Namibia. Sample is 14 cm across at its widest point. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harv...

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      300
      Explore Score
      6

  8. Stratified carbonate mud with debris flow deposits and ice-rafted debris from the upper member of the Ghaub Formation in Namibia. Sample is 9 cm across at its widest point. This sample is from the Snowball Earth Educational Rock Sample Suite, and comes courtesy of Paul Hoffman, Harvard University; Eugene Domack, ...

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