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Welcome to the mindat.org media viewer. Here is a quick guide to some of the options available to you. Different controls are available depending on the type of media being shown (photo, video, animation, 3d image)

Controls - all media types

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Use the mouse or your finger to drag the image or the view area of the image around the screen.

< and > at the left and right hand side of the screen move forwards and backwards for the other images associated with the media you selected. Usually this is for further photos of the same specimen. Keyboard shortcuts: use the left and right arrow keys.

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? opens this help window. Keyboard shortcuts: use the H key or the ? key.

Other keyboard shortcuts:

1Fit image to screen
2Fill screen with image
5Display at full resolution
<Make background darker
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Controls - Video

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Controls - Animation (Spin Rotation)

Animation (usually 360 degree spin rotations) have their own controls: - enable spin mode. Note that while images are loading this option will not be available but will be automatically activated when the animation has loaded. Once active you can spin the image/change the animation by moving your mouse or finger on the image left/right or by pressing the [ or ] keys.

The button switches to move mode so that you can use your mouse/fingers to move the image around the screen as with other media types.

The button, or the P key will start playing the animation directly, you can interrupt this by using the mouse or finger on the image to regain manual movement control.

Controls - 3D Stereoscopic images

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To enable/disable 3D stereo display of a compatible stereo pair image press the 3 key. If the left/right images are reversed on your display (this often happens in full-screen mode) press the 4 key to reverse them.

Summary of all keyboard shortcuts

1Fit image to screen
2Fill screen with image
3Switch to 3D display of stereo pair
4Switch left/right images in 3D mode
5Display at full resolution
<, >Make background darker/lighter
H or ?Show/hide this help page
PPlay/Pause Video or Animation
[, ]Backwards/forwards one frame (Animation only)
up arrowShow information box
down arrowHide information box
left arrowPrevious image/media page
right arrowNext image/media page
spaceHide/dim titles and buttons

Copyright © Jamison K. Brizendine
minID: 2RR-V32


Copyright © Jamison K. Brizendine  - This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 5 cm x 3.7 cm x 1.3 cm

This is a miniature specimen of chert from the Barrett Paving Materials Quarry (Middleboro Stone Quarry), Richmond, Indiana, United States. The chert from this quarry are identified as part of the Silurian Brassfield Formation (~430 ma). The chert from this quarry is typically white to a gray color, nodular in shape, and is typically stained by iron oxides. The limestone and dolostones found in this quarry are typically used for aggregate (Parker 2006).

It is interesting to note that the quarry’s rocks differ greatly from the Upper Ordovician rocks found south of this quarry. The Upper Ordovician rocks show a great diversity of marine fossils, while the exposed Silurian rocks in this quarry show a distinct lack of fossils. It is theorized that a mass extinction even occurred between the two periods, but the possible cause is still unknown and hotly debated. The leading theory suggests that increased volcanic activity may be a possible cause to the extinction event (Young et al. 2007).

I collected this specimen on November 23, 2004 on an Earlham College sedimentology field trip. I mostly collected reference specimens from this quarry for a field trip write up. This was one of these specimens.

The specimen is approximately 5 x 3.7 x 1.3 cm

Jamison K. Brizendine specimen and photo

References Cited:

Parker, R., 2006, From the tropics to the tundra: Snapshots of the Lower Paleozoic and the Quaternary near Richmond, Indiana, in Professional Geologists of Indiana, November 4, 2006, Field Trip Guidebook: Richmond, Indiana, Earlham College Geosciences, 16 p.

Young, S., Saltzman, M., Foland, K., Linder, J., and L. Kump, 2009, A major drop in seawater 87Sr/86Sr during the Middle Ordovician (Darriwilian): Links to volcanism and climate?: Geology, v. 37 (10), Geological Society of America, p. 951-954.

Collected: 2004

This photo has been shown 549 times
Photo added:23rd Sep 2014
Dimensions:1301x1225px (1.59 megapixels)
Date/Time of Photo:5th Jan 2007 21:45:09
Camera:KODAK Z1275 ZOOM
Exposure time:1/50s
Focal Length:22mm
Focal Length (35mm film equivalent):105mm
ISO speed:64
View Jamison K. Brizendine's Photos View Chert Gallery

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