valley

Falstaff · Jun 23, 2005, 04:08 AM

riles9262 · Jun 23, 2005, 11:49 PM

That's a really nice one...too bad the air looks polluted.

Falstaff · Jun 24, 2005, 12:29 AM

it is actually...several brush fires sent ash and other particulate matter into the air...downright nasty.

CDsDontBurn · Jun 24, 2005, 12:40 AM

oh so purty

. looks like it's part of a fault line

Falstaff · Jun 24, 2005, 05:17 AM

those are actually accreted terrains from the collision of several layers of a geologic unconformity, they are actually composed of layers of sea bottom and crust that have been turned upside down and forced up on shore by tectonic activity..

CDsDontBurn · Jun 24, 2005, 08:26 AM

so you're saying that at one point in Earth's life, those mountains were ocean floor?

Falstaff · Jun 24, 2005, 01:08 PM

Plate tectonics is a relatively new theory that has revolutionized the way geologists think about the Earth. According to the theory, the surface of the Earth is broken into large plates. The size and position of these plates change over time. The edges of these plates, where they move against each other, are sites of intense geologic activity, such as earthquakes, volcanoes, and mountain building. Plate tectonics is a combination of two earlier ideas, continental drift and sea-floor spreading. Continental drift is the movement of continents over the Earth's surface and in their change in position relative to each other. Sea-floor spreading is the creation of new oceanic crust at mid-ocean ridges and movement of the crust away from the mid-ocean ridges. California is earthquake intensive because of the movement of faults that are constantly in motion.

The Faralon Plate, named for the Faralon islands is not readily seen because it actually is being subducted under the edge of California, but it is responsible for quakes there, much of the earth is actually crust that is formed by volcanic activity and forced upward by plate collision. The rest of the older earth crust is called "shield" crust, but it just means it is older geologically. California is relatively new crust, as is Nevada as well. Those areas of intense volcanic activity and mountian building typically have large deposits of sulfides, like copper, silver, gold, etc.

CDsDontBurn · Jun 24, 2005, 04:44 PM

nice read jeff

riles9262 · Jun 24, 2005, 06:29 PM

Thanks jeff, that's straight from my geography 113 class in college

Falstaff · Jun 24, 2005, 08:08 PM

ha ha, took two years of Geology in Reno, wanted to work for the Keencutt mining company

Jun 23, 2005, 04:08 AM	#1
Falstaff Old Codger Join Date: Sep 2002 Location: USAFA Posts: 19,048 Rep Power: 207	valley __________________ "Inspiration is always a surprising visitor."

Jun 23, 2005, 11:49 PM	#2
riles9262 Driverheaven brewmaster Join Date: Oct 2002 Location: British Columbia, Canada Posts: 4,842 Rep Power: 72 System Specs	That's a really nice one...too bad the air looks polluted. __________________ A beer a day keeps the doctor away.

Jun 24, 2005, 12:29 AM	Thread Starter #3
Falstaff Old Codger Join Date: Sep 2002 Location: USAFA Posts: 19,048 Rep Power: 207	it is actually...several brush fires sent ash and other particulate matter into the air...downright nasty. __________________ "Inspiration is always a surprising visitor."

Jun 24, 2005, 12:40 AM	#4
CDsDontBurn Lurking DriverHeaven Join Date: May 2003 Location: Southern California Posts: 22,779 Rep Power: 235 System Specs	oh so purty . looks like it's part of a fault line __________________ Her First Day \| A year later

Jun 24, 2005, 05:17 AM	Thread Starter #5
Falstaff Old Codger Join Date: Sep 2002 Location: USAFA Posts: 19,048 Rep Power: 207	those are actually accreted terrains from the collision of several layers of a geologic unconformity, they are actually composed of layers of sea bottom and crust that have been turned upside down and forced up on shore by tectonic activity.. __________________ "Inspiration is always a surprising visitor."

Jun 24, 2005, 08:26 AM	#6
CDsDontBurn Lurking DriverHeaven Join Date: May 2003 Location: Southern California Posts: 22,779 Rep Power: 235 System Specs	so you're saying that at one point in Earth's life, those mountains were ocean floor? __________________ Her First Day \| A year later

Jun 24, 2005, 01:08 PM	Thread Starter #7
Falstaff Old Codger Join Date: Sep 2002 Location: USAFA Posts: 19,048 Rep Power: 207	Plate tectonics is a relatively new theory that has revolutionized the way geologists think about the Earth. According to the theory, the surface of the Earth is broken into large plates. The size and position of these plates change over time. The edges of these plates, where they move against each other, are sites of intense geologic activity, such as earthquakes, volcanoes, and mountain building. Plate tectonics is a combination of two earlier ideas, continental drift and sea-floor spreading. Continental drift is the movement of continents over the Earth's surface and in their change in position relative to each other. Sea-floor spreading is the creation of new oceanic crust at mid-ocean ridges and movement of the crust away from the mid-ocean ridges. California is earthquake intensive because of the movement of faults that are constantly in motion. The Faralon Plate, named for the Faralon islands is not readily seen because it actually is being subducted under the edge of California, but it is responsible for quakes there, much of the earth is actually crust that is formed by volcanic activity and forced upward by plate collision. The rest of the older earth crust is called "shield" crust, but it just means it is older geologically. California is relatively new crust, as is Nevada as well. Those areas of intense volcanic activity and mountian building typically have large deposits of sulfides, like copper, silver, gold, etc. __________________ "Inspiration is always a surprising visitor." Last edited by fallang_jeff; Jun 24, 2005 at 01:19 PM.

Jun 24, 2005, 04:44 PM	#8
CDsDontBurn Lurking DriverHeaven Join Date: May 2003 Location: Southern California Posts: 22,779 Rep Power: 235 System Specs	nice read jeff __________________ Her First Day \| A year later

Jun 24, 2005, 06:29 PM	#9
riles9262 Driverheaven brewmaster Join Date: Oct 2002 Location: British Columbia, Canada Posts: 4,842 Rep Power: 72 System Specs	Thanks jeff, that's straight from my geography 113 class in college __________________ A beer a day keeps the doctor away.

Jun 24, 2005, 08:08 PM	Thread Starter #10
Falstaff Old Codger Join Date: Sep 2002 Location: USAFA Posts: 19,048 Rep Power: 207	ha ha, took two years of Geology in Reno, wanted to work for the Keencutt mining company __________________ "Inspiration is always a surprising visitor."