Lance Formation

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What Wikipedia says

The Lance (Creek) Formation is a division of Late Cretaceous (dating to about 69–65.5 Ma) rocks in the western United States. Named after Lance Creek, Wyoming, the microvertebrate fossils and dinosaurs represent important components of the latest Mesozoic vertebrate faunas.

Excerpt from the Wikipedia article “Lance Formation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Anky-man, CC BY-SA 3.0, via Wikimedia Commons.