10
$\begingroup$

Is there any sort of database that provides the locations of exposures of certain geologic groups or formations?

I ask because I have read that halite occurs in the Michigan Basin, and specifically occurs in beds of the Salina Formation (Silurian) and the Detroit River Group (Devonian). I would love to find a source (preferably a map) that provides locations where these features (or really, halite) are at or near the surface.

Thanks.

$\endgroup$
  • 1
    $\begingroup$ USGS geological maps: mrdata.usgs.gov/geology $\endgroup$ – stevej Nov 6 '14 at 2:07
  • $\begingroup$ @stevej Do you know of a feature where I can search for particular features? I think maybe I can load the shapefile in ArcMap and look in the attribute table for what I want, but I'm curious if there is an easier way. $\endgroup$ – Alex Petzke Nov 7 '14 at 0:57
  • $\begingroup$ Hi Alex, I'd say downloading the data and loading into ArcMap/QGIS/whatever would be the easiest way to go. Online GIS mapping tools are generally not very powerful, unfortunately. $\endgroup$ – stevej Nov 7 '14 at 2:22
  • $\begingroup$ Also this book might contain useful maps: rock.geosociety.org/Store/detail.aspx?id=FLD031 $\endgroup$ – stevej Nov 7 '14 at 2:24
5
$\begingroup$

You may also find localised geological guides, such as the Roadside Geology series.

http://geology.com/store/roadside-geology.shtml has a listing. While I have not used them, I have seen them crop up fairly often as a nice option when looking for interesting geology in more general terms, including for some outcrops.

(I would have made this a comment, rather than an answer, but have no rep yet.)

$\endgroup$
3
$\begingroup$

Macrostrat is (or in fact will be) what you are looking for I think.
This database is still in development and is apparently only available through the website as a beta so far. It only seems to cover the US, Australia and New Zealand to this date but you can search for specific formations.

From your example, here is a screenshot of the result I had while looking for surface outcrops of halite:

US halite

or when looking for the Salina Group (the blue dots are cross-reference from the Paleobiology Database, if I understood correctly):

enter image description here

As they say on the front page, so far, the functionalities are very limited.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.