The Devonian in Utah
416 - 359 Ma
The devonian dates back to 354-417 million years ago. Devonian is a geologic period and a system. The word devonian comes from Devon England where rocks from our present were first studied. The first seed bearing plants spread across dry land forming a forest.*
In the nineteenth century texts the devonian has been called the"old Red Age" after the red and the brown terrestrial deposits known in the united kingdom. The devonian was a relatively warm period and it didn't lack of any glaciers. During the devonian there were important changes in the land masses on the globe. Interonging of marine and non-marine deposits proved the devonian age of the old red sandstone. THe devonian was a time of great tectonics activity as Euroamerica and Gondwana drew closer together.*
Utah was in a shallow, warm environment, thus allowing limestone to form. It also contained traces of sandstone from the ocean. The fossils found today are mostly primitive ocean life, including brachiopods, sponges, coral, conodonts, and very rarely is the jawed and jawless fish found. The largest concentration of Devonian rocks are found in the great basin area. There is also a small bit of rock in south-eastern Utah. Most will be underground, but some can be found on the surface.*
PT. 2
The name "Devonian" originally came from where rocks were first studied, in Devon, England. During the this period, Utah was underwater as well as many other places, which is why it is named “The Age Of Fishes" because of evolution, this is the time where many bizarre and strange creatures began appear, especially fishes. The climate in Utah was usually around 86 degrees Fahrenheit, which is relatively warm for new species to grow and develop.
During the Devonian period, Utah was mainly underwater, with shallow seas around eastern Utah and deeper seas around western Utah. In western Utah, all of the deeper seas contained very primitive wildlife, coral, brachiopods and conodonts. The Stansbury uplift (located in north-central Utah) became a prominent ridge that is above sea level started to form around the end of the Devonian Period. After The Stansbury uplift formed, amphibians began to appear and inhabit the area.
The Devonian Period began to end around 375 million years ago and the Silurian Period began. Part of the reason extinction began was because the CO2 levels dropped suddenly, new forests developed and took all of the carbon out of the atmosphere, shifting the atmosphere.
In the nineteenth century texts the devonian has been called the"old Red Age" after the red and the brown terrestrial deposits known in the united kingdom. The devonian was a relatively warm period and it didn't lack of any glaciers. During the devonian there were important changes in the land masses on the globe. Interonging of marine and non-marine deposits proved the devonian age of the old red sandstone. THe devonian was a time of great tectonics activity as Euroamerica and Gondwana drew closer together.*
Utah was in a shallow, warm environment, thus allowing limestone to form. It also contained traces of sandstone from the ocean. The fossils found today are mostly primitive ocean life, including brachiopods, sponges, coral, conodonts, and very rarely is the jawed and jawless fish found. The largest concentration of Devonian rocks are found in the great basin area. There is also a small bit of rock in south-eastern Utah. Most will be underground, but some can be found on the surface.*
PT. 2
The name "Devonian" originally came from where rocks were first studied, in Devon, England. During the this period, Utah was underwater as well as many other places, which is why it is named “The Age Of Fishes" because of evolution, this is the time where many bizarre and strange creatures began appear, especially fishes. The climate in Utah was usually around 86 degrees Fahrenheit, which is relatively warm for new species to grow and develop.
During the Devonian period, Utah was mainly underwater, with shallow seas around eastern Utah and deeper seas around western Utah. In western Utah, all of the deeper seas contained very primitive wildlife, coral, brachiopods and conodonts. The Stansbury uplift (located in north-central Utah) became a prominent ridge that is above sea level started to form around the end of the Devonian Period. After The Stansbury uplift formed, amphibians began to appear and inhabit the area.
The Devonian Period began to end around 375 million years ago and the Silurian Period began. Part of the reason extinction began was because the CO2 levels dropped suddenly, new forests developed and took all of the carbon out of the atmosphere, shifting the atmosphere.
all pictures are from http//www.earth.gis.usu.edu/utah
