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historicalmarkerproject/markers/HM2CU3_rock-flour-millstone_Golden-CO.html
Rock Flour Millstone. . The Rock Flour Mill, which stood near here in the late 1800's, used waterpower from the creek to turn large stone wheels that ground wheat into flour. Water-powered gristmills have been in use since the time of the…
historicalmarkerproject/markers/HM2CMF_cretaceous-time_Morrison-CO.html
Cretaceous Time. The tan sandstone of the Dakota Group form the crest of Dinosaur Ridge and were deposited more than 100 million years ago during Cretaceous time along the western shore of the Western Interior Seaway. At that time, only low hills…
historicalmarkerproject/markers/HM2CME_volcanic-ash_Morrison-CO.html
Volcanic Ash. A volcano erupted hundreds of miles from here and ash from the volcano blanketed this area, which was a swampy environment. Subsequent burial, compaction, and chemical alteration led to this four inch white to rusty orange colored …
historicalmarkerproject/markers/HM2CKG_brontosaur-bulges_Morrison-CO.html
Brontosaur Bulges. The downward bulges in the rock layers are most likely dinosaur tracks viewed in cross section. When dinosaurs walked in soft sand they sank in, pushing down and distorting the layers beneath their feet. The tracks later fille…
historicalmarkerproject/markers/HM2CJS_theropod-track_Morrison-CO.html
Theropod Track. First noted by Matt Mossbrucker and later described by Dr. Martin Lockley, this theropod (a carnivorous dinosaur) track was part of the top layer of sandstone at the Bone Site, 50 yards to the north. During road construction in 1…
historicalmarkerproject/markers/HM2CJL_late-jurassic-time_Morrison-CO.html
Late Jurassic Time. This is part of the Morrison Formation accumulated around 150 million years ago. Monsoonal (seasonal) rains caused flooding which dotted the terrain with small lakes, ponds, and braided streams. These served as watering holes …
historicalmarkerproject/markers/HM2CJC_rock-deformation_Morrison-CO.html
Rock Deformation. Mountain-building processes generate massive pressures in the earth's crust. Such pressures cause the rock layers to tilt, buckle, or fold and sometimes to break or crack. In addition to the obvious tilting of rocks along the D…
historicalmarkerproject/markers/HM2CGF_bone-deposition_Morrison-CO.html
Bone Deposition. Dinosaur bones were deposited here on the inside of a meander by a fast-flowing stream. This deposit known as a "point bar" grew by the addition of sand, causing growth of the point bar towards the outer bank and downst…
historicalmarkerproject/markers/HM2CEY_the-rocky-mountains_Morrison-CO.html
The high mountains west of here are the beginning of the Rocky Mountains.
They are made up of resistant Precambrian granite and gneiss. The prominent red rocks
in Red Rocks Park are the Fountain Formation, a series of sandstones and conglomera…
historicalmarkerproject/markers/HM25I7_triceratops-tracks_Golden-CO.html
Triceratops: 30 feet long, 6-12 ton Herbivore
Several tracks of Triceratops or a closely related horned dinosaur were discovered in this area. Among
horned dinosaurs, Triceratops is the most likely track maker because many of its bones have be…