File:Tidalites (Salem Limestone, Middle Mississippian; Rt. 37 roadcut north of Harrodsburg, Indiana, USA) 1 (14851161380).jpg

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Tidalites in limestone from the Mississippian of Indiana, USA. (9.8 centimeters worth of section)

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: uppermost Salem Limestone, middle Middle Mississippian

Locality: roadcut along Rt. 37, ~2 miles north of Harrodsburg, southern Monroe County, south-central Indiana, USA
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Source Tidalites (Salem Limestone, Middle Mississippian; Rt. 37 roadcut north of Harrodsburg, Indiana, USA) 1
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@N05/14851161380 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

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current17:56, 7 December 2019Thumbnail for version as of 17:56, 7 December 2019687 × 1,869 (1.02 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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