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The Middle and Late Ordovician deposits in Kentucky are exceptionally rich in bryozoans, [52] but bryozoans can be found in Kentucky rocks all the way into the Pennsylvanian period. They may be Kentucky's most common type of fossil. [53] Archimedes, a distinctive genus of Mississippian fenestrate bryozoan known for its screw-like skeletal structure
This means that SDSS J0018−0939 most likely preserved the elemental abundance ratios produced by a first-generation very-massive star. [7] First generation stars are expected to self-regulate their growth by radiative feedback in the formation process, and to achieve masses typically tens of times that of the Sun. A fraction of stars might ...
Throughout the 1970s and 1980s, Kentucky led the US in coal production. A well drilled in 1819 in salt water, in the South Fork of the Cumberland River revealed the first indications of petroleum in Kentucky. A rush to produce paraffin from oil in the 1850s prompted discoveries in Clinton, Cumberland, Allen, Barren, Meade, Wayne and Russell ...
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The year after the Hadrosaurus's fossils were first identified, 1859, state agricultural chemist Philip T. Tyson found the first documented dinosaur fossils of the Arundel Formation in an iron pit at Bladensburg, Maryland. [43] The discovery consisted of two fossil teeth. Tyson took the dinosaur teeth to a local doctor named Christopher Johnston.
Tests of animal bones found nearby suggest that the climate was harsh — comparable to modern-day Siberia. That means humans were having success in an extreme climate some 45,000 years ago.
Fire regimes of United States plants. Savannas have regimes of a few years: blue, pink, and light green areas. When first encountered by Europeans, many ecosystems were the result of repeated fires every one to three years, resulting in the replacement of forests with grassland or savanna, or opening up the forest by removing undergrowth. [23]
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