Talk:Onondaga Limestone

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Helderberg?[edit]

Is the Helderberg Escarpment part of this formation?--Triskele Jim 16:43, 23 October 2012 (UTC)

I don't think so. The Helderberg formation lies under the Onondaga formation, and one of its outcrops forms the Helderberg Escarpment. Onondaga outcrops should be "inside" the Helderberg outcrops (south of the Helderberg where the Onondaga runs east-west). I think maybe the map of the Onondaga outcrop is not complete, I think it goes south at Albany. Maybe there is an Onondaga outcrop to the west of the Helderberg Escarpment? PAR (talk) 14:56, 23 October 2012 (UTC)[reply]

Actually, since I asked that, my office recieved an antique geologic map of Albany county, and one of the layers in the Helderberg Escarpment is labeled "Onondaga limestone." It's titled "Preliminary Geologic Map of Albany County," and dated 1893, so it could be incorrect. I wish we had a scanner large enough for it - it would make an interesting addition to the Commons.--Triskele Jim 16:43, 23 October 2012 (UTC)

Escarpment vs. Formation[edit]

This article is more about a geographic feature (escarpment) than about a geologic formation. For example the USGS recognizes the Onondaga in 6 states ([1]), a much greater extent than implied by the map in this article. I think the article should be moved to Onondaga Escarpment so that more relevant geologic information can be included in this article and references to other escarpments can be deleted. The escarpment article can then link back to the formation article.Jstuby (talk) 04:12, 31 October 2012 (UTC)[reply]

I concur with Jstuby and second the motion - so to speak. I ask that his proposal be formally discussed. Thank you.Drdpw (talk) 02:04, 9 September 2013 (UTC)[reply]

(Two years later:) What matters is the common name in practice; we don't want to coin new terms or try to force names that are technically better or more official from some framework. Those comments are not clear on whether "Onondaga Escarpment" is a common term, and whether "Onondaga Formation" usually means the escarpment or not. --do ncr am 20:07, 4 September 2015 (UTC)[reply]

More falls[edit]

From the map in the article, comparing to Google maps, it looks like Skaneateles Falls (at Skaneateles Falls, New York) and Marcellus Falls (near Marcellus, New York) would be on the escarpment. Those are like rapids that descend over a fair distance, not as dramatic as Chittenango Falls. I'd like to add mention of them in this article and their own articles but is there a source to cite which states that they are on this escarpment?

Also there is

which is different, I think. And it is just south, I think: there is a Marcellus shale outcropping in Marcellus that is about 2 miles south of Marcellus Falls. --do ncr am 20:07, 4 September 2015 (UTC)[reply]

--do ncr am 20:07, 4 September 2015 (UTC)[reply]

content contradicts map...[edit]

The map shows the escarpment going well north of the Windsor, hitting Lake Huron about halfway between Windsor and the tip of the Bruce Peninsula. The content says the escarpment runs parallel to the Lake Erie shorline, all the way to Windsor.

I was struck by how the map's rendering of the escarpment has a curve in it very similar to that of the Grand River. I'd be interested in a map that showed the main course of the Grand, Mohawk and Hudson rivers. Geo Swan (talk) 20:43, 27 November 2019 (UTC)[reply]