<p>You may also find localised geological guides, such as the Roadside Geology series.</p>

<p><a href="http://geology.com/store/roadside-geology.shtml">http://geology.com/store/roadside-geology.shtml</a> 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.</p>

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

CC BY-SA 3.0
2015-02-07T08:02:54.607Z
2015-02-07T08:02:54.607Z
mtb-za
<p><a href="http://macrostrat.org/" rel="nofollow noreferrer">Macrostrat</a> is (or in fact will be) what you are looking for I think.<br>
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 <a href="http://macrostrat.org/search_form.php" rel="nofollow noreferrer">search</a> for specific formations.</p>

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

<p><img src="https://i.sstatic.net/SP93h.png" alt="US halite"></p>

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

<p><img src="https://i.sstatic.net/xHQlL.png" alt="enter image description here"></p>

<p>As they say on the front page, so far, the functionalities are very limited.</p>

CC BY-SA 3.0
2015-02-09T13:21:20.743Z
2015-02-09T13:29:14.510Z
2015-02-09T13:29:14.510Z
plannapus
<p>Is there any sort of database that provides the locations of exposures of certain geologic groups or formations?</p>

<p>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.</p>

<p>Thanks.</p>

CC BY-SA 3.0
2014-11-06T02:07:55.680Z
USGS geological maps: http://mrdata.usgs.gov/geology/
stevej
CC BY-SA 3.0
2014-11-07T00:57:55.557Z
@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.
Alex Petzke
CC BY-SA 3.0
2014-11-07T02:22:29.070Z
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.
stevej
CC BY-SA 3.0
2014-11-07T02:24:08.830Z
Also this book might contain useful maps: http://rock.geosociety.org/Store/detail.aspx?id=FLD031
stevej
<geology><stratigraphy>
Database of geological group or formation exposures?
Alex Petzke
# Database of geological group or formation exposures?

(Asked by: username_0 on 2014-11-05)

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.

**Tags:** geology, stratigraphy

> **Comments:**
> **username_1**: USGS geological maps: http://mrdata.usgs.gov/geology/  
> **username_0**: @username_1 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.  
> **username_1**: Hi username_0, 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.  
> **username_1**: Also this book might contain useful maps: http://rock.geosociety.org/Store/detail.aspx?id=FLD031  

---

## 2 answers

### Answer by username_2 on 2015-02-07. Score: 5

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.)


---

### Answer by username_3 on 2015-02-09. Score: 3

[Macrostrat](http://macrostrat.org/) 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](http://macrostrat.org/search_form.php) for specific formations.

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

![US halite](https://i.sstatic.net/SP93h.png)

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](https://i.sstatic.net/xHQlL.png)

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


---

