Revision as of 06:49, 19 June 2019 edit Dawnseeker2000 (talk \| contribs) Autopatrolled, Extended confirmed users, File movers, New page reviewers, Pending changes reviewers, Rollbackers 468,947 edits Typo fixing, typo(s) fixed: recently- → recently Tag: AWB ← Previous edit		Revision as of 22:27, 13 July 2019 edit undo Musicman103 (talk \| contribs) Extended confirmed users 1,492 edits →‎Geology: typo Next edit →
Line 34: The layer of rock at the peak of the hill is a [[basaltic andesite]] dating to 23-24 Ma. This caps a 30-36 meter-thick layer of [[tuff]] (compacted volcanic ash) above another layer of basaltic andesite, both dating to 26-28 Ma. Tuffs and andesite exposed at the base of the hill, on the south side, date to approximately 60 Ma.<ref name="geologic map"/> Volcanic ash and breccia, along with ancient lava beds, or ''lahars,'' can be also be found on the mountain, further evidence of a once active volcanic field that formed the Tucson Mountain range.{{Citation needed\|date=September 2016}} ==Etymology of "Sentinel Peak"==

Sentinel Peak (Arizona): Difference between revisions