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historicalmarkerproject/markers/HM24UD_under-the-sea_Wall-SD.html
Ammonite fossils found in the park are evidence that this area was under water 75 million years ago. Some ammonites could grow to more that three feet across and served as a food source for giant mosasaurs and other predators.
The Western Inter…
historicalmarkerproject/markers/HM24U7_see-ya-later-alligator_Wall-SD.html
Prehistoric alligators lived in swampy conditions, as they do today.
Physically, alligators have changed mostly in size over the last several million years. Modern alligators are larger, growing up to 14 feet long. Ancient alligators grew to on…
historicalmarkerproject/markers/HM19KM_high-security_Wall-SD.html
The fence in front of you once guarded the Delta-09 Launch Facility which held a Minuteman II intercontinental ballistic missile (ICBM). During the Cold War, anyone or anything that crossed this fence was in serious trouble. Standing orders meant …
historicalmarkerproject/markers/HM166O_journey-to-wounded-knee_Wall-SD.html
Journey to Wounded Knee-December 24, 1890 a bitter Christmas Eve wind rattled the wagon in which Minneconjou Chief Big Foot lay waiting while his people cleared a pass down the Badlands Wall. Several hours of hard work with axes and spades made th…
historicalmarkerproject/markers/HM2CK_born-of-volcanos_Wall-SD.html
Thirty-seven million years ago, the ancient crystalline core of the Black Hills had already been exposed by erosion. The long blue profile of those mountains, visible to the west, looked much as it does now.
About that time, streams flowing fro…
historicalmarkerproject/markers/HM2CH_jungle-on-a-seabed_Wall-SD.html
A jungle grew here. Before that, a shallow sea covered the land. Both are gone now, but both left evidence of their passing.
The sea's signature is ammonites, baculites, and clams, pearly fossils entombed in a fossil mud called the Pierre Shale…