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Ordovician rocks in Illinois are divided into three series, each separated by an unconformity; from oldest to youngest, these are the Canadian, Champlainian, and Cincinnatian series. Ordovician features in Illinois include the now-buried Glasford Structure in Peoria County , a crater caused by a meteorite impact roughly 455 million years ago.
The oldest dated rocks formed on Earth, as an aggregate of minerals that have not been subsequently broken down by erosion or melted, are more than 4 billion years old, formed during the Hadean Eon of Earth's geological history, and mark the start of the Archean Eon, which is defined to start with the formation of the oldest intact rocks on Earth.
Today Mineral still supports a grain elevator, a restaurant/tavern, a library, a new post office, a Methodist Church, a volunteer Fire Department, and a trucking business. The old school building has been razed. A new ethanol plant is being built just two miles west of town and is bringing hope for a resurgence in population for the area.
The quality of the water has a pH of 7.11 and a mineral breakdown between 500 and 700 parts per million. [3] The springs produce over 30,000 gallons every day. [4] It originally fed a former Peoria lake called Goose Lake, which was drained in the 1800s. [4] The site was a Native American campground. Artifacts can still be found around the site. [2]
The Mazon Creek fossils are found in the Upper Carboniferous Francis Creek Shale. [6] The type locality is the Mazon River (or Mazon Creek), a tributary of the Illinois River near Morris, Grundy County, Illinois. The 25 to 30 meters of shale were formed approximately , during the Pennsylvanian period.
The ditching and draining of the Graue Mill farmstead was typical of German-American settlement patterns in the Midwest in the 1840s and 1850s, as the thrifty German emigrants found assets in tracts of land that had been left behind by earlier, English-speaking frontiersmen and women. Graue could not build his entire mill from onsite materials.
Long before it was washed away by Ohio River floodwaters, there was a metal grate in the floor of the first bank building in Illinois. Really just a log house in Old Shawneetown, owner John ...
Hadean zircon is the oldest-surviving crustal material from the Earth's earliest geological time period, the Hadean eon, about 4 billion years ago. Zircon is a mineral that is commonly used for radiometric dating because it is highly resistant to chemical changes and appears in the form of small crystals or grains in most igneous and metamorphic host rocks.