Talk:Kohala (mountain)

Last eruption
I've seen two different dates given for Kohala's last eruption: 120,000 years ago, which is what we currently say in our article, and 60,000 years ago (e.g. here). These seem to originate in two papers, from 1969 and 1972 respectively: and. Does anyone has access to these? It would be nice to understand the discrepancy. -- Avenue (talk) 13:11, 31 March 2009 (UTC)
 * 60,000 appears to be the older figure, but I'm guessing. The newer USGS website says it last erupted "240,000 to 120,000 years ago" and that link is dated 1998 so I would go with it until we find out more details. Viriditas (talk) 13:45, 31 March 2009 (UTC)
 * Checked out the Atlas of Hawaii (1998) which says Kohala's "oldest lava is 460,000 years old and its postshield lava is as recent as 60,000 years old." The Atlas also says Kohla "last erupted more than 60,000 years ago" and attributes the statement to geologist Christina Heliker, although it looks like she just edited the material. Viriditas (talk) 14:01, 31 March 2009 (UTC)
 * USGS still uses the 60,000 figure (looks like they were quoting the Atlas) so why this page? NPS still uses 60,000. Viriditas (talk) 14:07, 31 March 2009 (UTC)
 * HCV uses the 120,000 figure, so I would go with that as it was last updated in 2005. Bingo.  They list their sources. :) Viriditas (talk) 14:12, 31 March 2009 (UTC)
 * I had seen most of those. The HCV table doesn't help; it cites Wright and Pierson (1992), whose Appendix 1 gives a similar table without any citations. But I have found another source (Dekker et al, cited in the Atlas of Hawaii) that summarises the papers I mentioned above, as follows: "Ages on 12 samples from the Hawi Volcanics (MacDougall, 1969; MacDougall and Swanson, 1972) range from 0.261 ± 0.005 to 0.061 ± 0.001 Ma." So it seems that 60,000 years ago is correct. I'll add it to the article soon. -- Avenue (talk) 00:52, 1 April 2009 (UTC)
 * HCV is up to date as of 2005, and there has been recent research (McMurtry and Tappin, 2004?) that may lead to answers. I'm not at a computer right now (typing from cell) so I can't pursue this until later, but going with older data seems a bit odd. Viriditas (talk) 01:59, 1 April 2009 (UTC)
 * Avenue, I think I have tracked this down and you may need to revert your changes. Please see USGS Open-File Report 2007 1089.  My mobile device won't let me paste the URL, but you should be able to track down the most recent data with that title.  I haven't had time to finish reading it but the figure looks like it comes from Wolfe and Morris, 1996 among other places.  Viriditas (talk) 04:11, 1 April 2009 (UTC)
 * Fair enough; page 41 of the pamphlet for USGS Open-File Report 2007-1089 does suggest there are reasonable grounds for scepticism about at least some of the earlier dates. I'll revert my changes completely for now. I think we should at least mention the earlier dates, however, unless Wolfe and Morris (or someone else) was able to conclusively dismiss them. I'll look into that tomorrow. -- Avenue (talk) 08:56, 1 April 2009 (UTC)

Note: Need to check Clague, 1998 and Jones, 1995. Viriditas (talk) 03:43, 1 April 2009 (UTC)
 * There's a para devoted to the inconsistancy among dates. Res Mar 19:08, 26 June 2009 (UTC)

Oldest
How can Kohala be the oldest volcano of Hawaii if Māhukona was the first volcano to form part of Hawaii? Black Tusk (talk) 02:56, 18 April 2009 (UTC)
 * I think there is a meaningful distinction here between the five volcanoes that currently form part of the island (i.e. protrude above the water) and those that are either too old (Māhukona) or too young (Lo'ihi) to do so. -- Avenue (talk) 05:10, 21 April 2009 (UTC)
 * But shouldn't Māhukona be mentioned? And will Kohala go through the stage that Haleakala on Maui has gone through?Guanlongwucaii (talk) 10:31, 25 May 2009 (UTC)Guanlongwucaii
 * These are valid points. For the second, we have no clue. For the first, I've added a note saying that. Res Mar 02:30, 19 December 2009 (UTC)

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Move discussion in progress
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