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Snowball Earth > Snowball Earth Educational Rock Sample Suite PFH-4 by Robin Rohrback

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About This Gigapan

Taken by
Robin Rohrback Robin Rohrback
Explore score
0.10 Gigapixels
Date added
Apr 26, 2012
Date taken
Apr 26, 2012

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 that oceanic conditions be anoxic enough to allow for the precipitation of reduced iron (magnetite). Localized hematitic spotting is interpreted as the result of oxidation by dropstone deposition during the deep-freeze stage of a Snowball event. PFH-R is viewed as the stratigraphic equivalent of units like the Ghaub diamictite, but was deposited in a much deeeper oceanic basin during periods when ice cover prevented oceanic mixing and waters were highly anoxic.

Sample is 5.5 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 1.2.0087 (Windows)
Panorama size: 102 megapixels (10988 x 9352 pixels)
Input images: 20 (4 columns by 5 rows)
Field of view: 15.4 degrees wide by 13.1 degrees high (top=4.6, bottom=-8.5)
Vignette correction on: c1=-0.158 c2=0.0209
All default settings
Original image properties:
Camera make: unknown
Camera model: unknown
Image size: 4752x3168 (15.1 megapixels)
Capture time: unknown
Aperture: unknown
Exposure time: unknown
ISO: unknown
Focal length (35mm equiv.): unknown
White balance: unknown
Exposure mode: unknown
Horizontal overlap: 56.3 to 57.1 percent
Vertical overlap: 50.7 to 51.9 percent
Computer stats: 4000.13 MB RAM, 4 CPUs
Total time 2:08 (6.4 seconds per picture)
Alignment: 7.8 seconds, Projection: 30 seconds, Blending: 1:30
(Preview finished in 51 seconds)

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