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Illustration of the first specimen of Megatherium americanum from 1796 Life illustration of Megatherium americanum from 1863, depicting it with a short trunk. The earliest specimen of Megatherium americanum was discovered in 1787 by Manuel de Torres, a Dominican friar and naturalist, from a ravine on the banks of the Lujan River in what is now northern Argentina, which at the time was part of ...
The earliest megatheriid in North America was Sibotherium which arrived 5.3 million years ago, after crossing the recently formed Panamanian land bridge. At more than five tons in weight, 6 metres (20 ft) in length, and able to reach as high as 5.2 metres (17 ft), Eremotherium when fully erect was taller than an African bush elephant bull.
Over the past 15 years, sinkhole damage costs an average of $300 million a year in the United States. There are several ways to identify a sinkhole in progress.
All of these species overlapped between 4.5 and 4.9 million years ago (gray bar). Image from Samuels et al 2018. The site is situated within the Knox Group formation, a series of Cambrian-Ordovician limestones. Groundwater flowing through joints in these rocks creates caves and sinkholes, forming a region of karst topography. The sinkhole that ...
Three counties in Florida's Tampa area make up a region sometimes called "sinkhole alley" because of the over 20,000 sinkholes there, almost 75% of the sinkholes in the whole state, according to ...
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Little Salt Spring is a feature of the karst topography of Florida, specifically an example of a sinkhole.It is classified as a third magnitude spring. [4] The numerous deep vents at the bottom of the sinkhole feed oxygen-depleted groundwater into it, producing an anoxic environment below a depth of about 5 m (16.4 ft). [4]
Photos show snarled traffic and crews at the scene evaluating the extent of the damage of the sinkhole that closed a section of Interstate 80. New Jersey sinkhole: Photos show 40-foot-deep ...