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Snowball Earth > Snowball Earth Educational Rock Sample Suite PFH-3 by Robin Rohrback

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About This Gigapan

Taken by
Robin Rohrback Robin Rohrback
Explore score
0.34 Gigapixels
Date added
Jul 18, 2012
Date taken
Jul 18, 2012

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 interpreted as having been deposited during a period of short-lived, unusual climatic conditions during the rapid deglaciation and warming of calcium carbonate-saturated waters at the end of a Snowball event.

According to the Snowball Earth hypothesis, these super-saturated conditions are the compound result of cold ocean waters (cold favors higher CaCO3 solubility) created during glaciations, and increased CaCO3 weathering of terrestrial rocks with the resumption of the hydrologic cycle during the rapid shift from icehouse to greenhouse conditions.
Sample is 8 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 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.
Image made as part of the MAGIC project (Mid-Atlantic Geo-Imagery Collection) using Northern Virginia Community College's gigamacro rig, as seen here:
gigamacro.com/gigapixel-macro-imaging-system Will open in a new tab or window/

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Stitcher Notes


GigaPan Stitch version 2.0.0501 (Windows)
Panorama size: 337 megapixels (18408 x 18332 pixels)
Input images: 70 (7 columns by 10 rows)
Field of view: 10.2 degrees wide by 10.2 degrees high (top=5.4, bottom=-4.8)
Vignette correction on: c1=-0.0576 c2=-0.0117
All default settings
Original image properties:
Camera make: unknown
Camera model: unknown
Image size: 5184x3456 (17.9 megapixels)
Capture time: unknown
Aperture: unknown
Exposure time: unknown
ISO: unknown
Focal length (35mm equiv.): unknown
White balance: unknown
Exposure mode: unknown
Horizontal overlap: 56.8 to 59.9 percent
Vertical overlap: 51.6 to 56.2 percent
Computer stats: 4000.13 MB RAM, 4 CPUs
Total time 8:26 (7.2 seconds per picture)
Alignment: 46 seconds, Projection: 2:09, Blending: 5:30
(Preview finished in 3:55)

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