Where is the Bearpaw Formation?
Montana
The Bearpaw Formation, also called the Bearpaw Shale, is a geologic formation of Late Cretaceous (Campanian) age. It outcrops in the U.S. state of Montana, as well as the Canadian provinces of Alberta and Saskatchewan, and was named for the Bear Paw Mountains in Montana.
How old is Bearpaw Formation?
about 70 –75 million years old
intercalare, is found only in certain horizons of the Bearpaw Formation of Late Cretaceous age (about 70 –75 million years old). Because the iridescent layer is generally thin and fragile, most Ammolite is fashioned into assembled stones.
Where is the Prince Creek Formation?
Alaska
The Prince Creek Formation is situated in Alaska and dates to the Late Cretaceous, some 78 million years ago. It overlies the Schrader Bluff Formation and sits beneath the Sagavanirktok Formation. The deposits for this formation were formed during a greenhouse phase on a muddy coastal plain.
Where is the Two Medicine Formation?
The Two Medicine Formation is a geologic formation, or rock body, in northwestern Montana and southern Alberta that was deposited between 83.5 ± 0.7 Ma and 70.6 ± 3.4 Ma (million years ago), during Campanian (Late Cretaceous) time.
Is there fake ammolite?
Unusual Properties: Very fine orient or pearlessence. Treatments: Examples of fake ammolite are starting to show up on the market. As seen below, this is an ammolite with a large created red area that can be identified by the fact that the colors do not alter when rotated under the light.
Where can I dig for ammolite?
The Bearpaw Formation is exposed at Earth’s surface in parts of Alberta, Saskatchewan, Montana, and Utah. The only area known to yield gem-quality Ammolite in commercial amounts is located along the St. Mary River in southwestern Alberta, but small amounts of gem Ammolite have been found in other areas.
Is ammolite a shell?
Ammolite, meanwhile, is the trade name for the iridescent, nacreous layer of the shell of fossilized ammonite. Commercial quantities of gem-quality ammolite are only known to come very a few specific types of ammonite shells, the G&G article said.
How did the Morrison Formation form?
The deposits from their east-facing drainage basins, carried by streams and rivers from the Elko Highlands (along the borders of present-day Nevada and Utah) and deposited in swampy lowlands, lakes, river channels and floodplains, became the Morrison Formation.
How was Dinosaur Provincial Park formed?
The Dinosaur Park Formation is composed of sediments that were derived from the erosion of the mountains to the west. It was deposited on an alluvial to coastal plain by river systems that flowed eastward and southeastward to the Bearpaw Sea, a large inland sea that was part of the Western Interior Seaway.
Where was the maiasaura found?
Maiasaura was a herbivore. It lived in the Cretaceous period and inhabited North America. Its fossils have been found in places such as Montana. This dinosaur was named “The Good Mother” because there is evidence that she looked after her nest of eggs very well.
Which place called Egg Mountain?
The area known as Egg Mountain is located in Montana just south of the town of Choteau. It is an outcropping of the Two Medicine Formation, which is present in much of northwestern Montana.
Why is ammolite so expensive?
An official gemstone since 1981, ammolite comes from the fossilized shell of ancient marine mollusks, called ammonites, that lived in the Bearpaw Sea approximately 75 to 70 million years ago. The limited areal extent of this deposit is the primary reason why ammolite is so rare.
Where did the Bearpaw Formation get its name?
The Bearpaw Formation, also called the Bearpaw Shale, is a geologic formation of Late Cretaceous (Campanian) age. It outcrops in the U.S. state of Montana, as well as the Canadian provinces of Alberta and Saskatchewan, and was named for the Bear Paw Mountains in Montana.
Where does the Bearpaw Formation merge with the Pierre Shale?
It is overlain by the Horseshoe Canyon Formation in central Alberta; by the Blood Reserve Formation and the St. Mary River Formation in southern Alberta; by the Eastend Formation in southern Saskatchewan; and by the Fox Hills Formation in Montana. To the east, it merges into the Pierre Shale.
What kind of rock is the Bearpaw Sea made of?
The formation was deposited in the Bearpaw Sea, which was part of the Western Interior Seaway that advanced and then retreated across the region during Campanian time. It is composed primarily of dark grey shales, claystones, silty claystones and siltstones, with subordinate silty sandstones.
Where is the contact between the Bearpaw and Horseshoe Canyon Formations?
Contact (red arrow) between the underlying marine shales of the Bearpaw Formation and the coastal Horseshoe Canyon Formation. / 48.25000°N 109.50000°W / 48.25000; -109.50000 ( Bearpaw Formation)