File:Tidalites (Big Cottonwood Formation, Neoproterozoic; Utah, USA) (15037455712).jpg

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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
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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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current02:11, 6 December 2019Thumbnail for version as of 02:11, 6 December 20191,636 × 1,465 (1.25 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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