| Welcome to SP! - Sign-In | Register | ||
| | |
| MbPost.com -- It's SP for Mountain Biking! | ||
Southern Nevada > Sunrise Mountain > Comments
|
| cp0915 | Flashback | |
Voted 10/10 | For what it's worth, that 'Flashback' link at the bottom of the page has bad info. In an article about everyone's misidentification of Sunrise Mountain, it misidentifies Sunrise Mountain! | |
| Posted Feb 21, 2007 9:42 pm | ||
| MoapaPk | topped? | |
Hasn't voted | "Both Sunrise and Frenchman are partially topped with Vishnu Schist..." The Precambrian rocks of Frenchman Mt are at the base, on the W side, not the top. I'm not aware of any Precambrian rocks on Sunrise Mountain. I know there is a Wikipedia entry that claims the mountains are capped with Vishnu Schist, but that entry is very wrong. You might examine the USGS reports for Las Vegas and Lake Mead; these two reports are split at Sunrise Mt, so both are needed to get the full picture. They are at: Las Vegas Geology Lake Mead Geology The Proterozoic Rocks begin with "X". Vishnu Schist has actually never been identified near Frenchman Mt. There is, however, a gneiss that looks similar to other gneises that are correlative with the Vishnu Schist. The supposed Proterozoic rocks at Frenchman Mt. have never actually had a radiometric date determination, at least that was published by early 2007. EDIT: thanks for partly changing the text. However, I'm still curious about the PreCambrian rocks supposed to be at Sunrise Mountain. I've never seen any indication of these rocks on geologic maps. Since Frenchman Mountain is not closely related to Sunrise Mountain -- this discrepancy doesn't surprise me. Once more, there is actually no Vishnu Schist in this area; only gneisses that look similar to other gneisses presumed to be correlative with Vishnu Schist. | |
| Posted Apr 19, 2007 4:53 am | ||
|
