Aniakchak National Monument and Preserve is the name of a 6 miles (10 km) located in the middle of the boiler in the Alaska Peninsula. Geographers first noticed circular function on the landscape, and 1922 geological expedition confirmed the cause of depression. Several decades later, paleontologists made another discovery in Aniakchak: Dinosaurs lived in the area, and they have left behind some of its fossilized footprints.
Aniakchak is one of 232 parks in the American fossil stash. The National Park Service provides information on these findings as a natural part of the celebration of National Day Fossil (October 12), and the Earth Science Week.
Enhanced Thematic Mapper Plus on Landsat 7 satellite captured this natural color image Aniakchak National Monument and Preserve on September 15, 2000. The boiler dominates the view, and the southern coast casting a shadow over the blue-gray snow and ice around. (Due to the position of the sun, this image can make the optical illusion known as the relief of back.)
The lake is located near the Caldera, the northern coast of the margin. The vegetation is sparse right on the Caldera, but far from the slopes are green.
Caldera formed about 3,500 years ago when an explosive eruption blew about 3,000 feet (1,000 meters) of the overlying rock. Recent volcanic activity hailed caldera cinder cones and lava flows.
Aniakchak dinosaur tracks are much older than the crater. Plants were left eating dinosaurs some 70 million years ago. Anthony Fiorillo, which is based on the Museum of Nature and Science in Dallas, found the songs, and wrote them in 2004. Hadrosaurs the left, the tracks consist of small and large footprints to handprints.
Most people believe that dinosaurs lived in the tropics, or at least in temperate environments at high latitudes such as Alaska. So how dinosaurs grow so far north?
Theory of plate tectonics states that certain lands which are now located at high latitudes, once rested near Ecuador. So one explanation could be that relief was not in the same place where the footprints were formed. However, studies rock layers in the region indicate that the Aniakchak area was already in place at approximately the same latitude as 70 million years.
Although Aniakchak was about the same location (near 57 degrees north latitude), it does not mean he had the same climate. Indeed, the global climate 70 million years, considerably warmer than today. So the dinosaurs did not have to withstand the temperatures common in modern Alaska, although they had some cold conditions and possibly snow. Regardless of temperature, dinosaurs lived at high latitudes done with longer periods of darkness that night lasted nearly 18 hours during the winter in Aniakchak.
For more information related to dinosaurs, visit rareresource.com.
0 comments:
Post a Comment