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File:Tidalites (Salem Limestone, Middle Mississippian; Rt. 37 roadcut north of Harrodsburg, Indiana, USA) 2 (44725483515).jpg

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Tidalites in fine-grained limestone from the Mississippian of Indiana, USA. (~10.4 centimeters across at its widest near the base)

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. Why? 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) 2
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@N05/44725483515. It was reviewed on 6 November 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 November 2018

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current04:41, 6 November 2018Thumbnail for version as of 04:41, 6 November 20183,789 × 2,470 (6.7 MB)Lu Brito (talk | contribs)Transferred from Flickr via #flickr2commons

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