File:Tidalites (Big Cottonwood Formation, Neoproterozoic; Utah, USA) (15037455712).jpg
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Summary
editDescriptionTidalites (Big Cottonwood Formation, Neoproterozoic; Utah, USA) (15037455712).jpg |
Tidalites from the Precambrian of Utah, USA. (Cleveland Museum of Natural History public display, Cleveland, Ohio, USA) Tidalites are rhythmically laminated sedimentary rocks that record monthly tidal depositional cycles. They can occur in siliciclastic or carbonate rocks. Well-preserved tidalites will readily show neap tides & spring tides and can allow days-per-month counts and days-per-year counts. This information can tell us hours-per-day in the ancient past. Early in Earth’s history, the number of days per year was much higher than the current 365. The number of hours per day was also significantly less than 24. How come? Earth's rotation rate has slowed over time. Stratigraphy: Big Cottonwood Formation, lower Neoproterozoic, ~900 Ma |
Date | |
Source | Tidalites (Big Cottonwood Formation, Neoproterozoic; Utah, USA) |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15037455712 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:11, 6 December 2019 | 1,636 × 1,465 (1.25 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/4.5 |
ISO speed rating | 200 |
Date and time of data generation | 13:13, 22 July 2006 |
Lens focal length | 50 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:07, 25 August 2014 |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 13:13, 22 July 2006 |
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.3 APEX (f/4.44) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 10 |
DateTimeOriginal subseconds | 10 |
DateTimeDigitized subseconds | 10 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 75 mm |
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Scene control | None |
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Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 1,636 px |
Image height | 1,465 px |
Date metadata was last modified | 17:07, 25 August 2014 |