Inscription
Geology of Minnesota
Split Rock Region
The scenery of the region between Split Rock and Beaver Bay is the direct result of important events of early geologic time.
Lava flows, which had accumulated in this region to a thickness of about 30,000 feet, were lifted and arched by a huge mass of molten material rising through the earth's crust farther north. This mass, this Duluth Gabbro, is now extensively exposed in the Duluth area.
The lighthouse cliff standing 100 feet high is a fine-grained phase of Gabbro named Beaver Bay Diabase, the massive resistant character of which makes the shore of this region particularly bold and rocky.
At the base of the lighthouse on top of the cliff is another kind of rock, light green in color and coarse in texture, called Anorthosite. It is this rock, Anorthosite, which shows an excellent exposure in the highway cut at Silver Bay and stands up as prominent rounded hills from Split Rock to Carlton Peak near Tofte.
AND THE DEPARTMENT OF HIGHWAYS, STATE OF MINNESOTA
AIDED BY A GRANT FROM THE
LOUIS W. AND MAUD HILL FAMILY FOUNDATION
1955
Details
| HM Number | HM1G04 |
|---|---|
| Additional Information | See MNDOT's Inventory Sheet for the overlook for further info. |
| Series | This marker is part of the Minnesota Department of Highways series, and the Geological Society of Minnesota series. |
| Tags | |
| Historical Period | Pre Columbian |
| Historical Place | Other |
| Marker Type | Historic District |
| Marker Class | Historical Marker |
| Marker Style | Mounted |
| Marker Number | LA-BBT-023 |
| Year Placed | 1955 |
| Placed By | Geological Society of Minnesota, Minnesota Department of Highways |
| Marker Condition | No reports yet |
| Date Added | Thursday, October 16th, 2014 at 2:06am PDT -07:00 |
Pictures
Photo Credits: [1] MARTHA DECKER [2] MARTHA DECKER [3] MARTHA DECKER [4] MARTHA DECKER [5] MARTHA DECKER [6] MARTHA DECKER [7] MARTHA DECKER
Locationbig map
| Location Description | This marker is on the overlook wall at the wayside where the lighthouse can be seen. This overlook used to be right on the highway, but the highway was rerouted several years ago, and the stretch of old highway is now a much safer wayside. |
|---|---|
| UTM (WGS84 Datum) | 15T E 622728 N 5228583 |
| Decimal Degrees | 47.19928333, -91.37965000 |
| Degrees and Decimal Minutes | N 47° 11.957', W 91° 22.779' |
| Degrees, Minutes and Seconds | 47° 11' 57.4200" N, 91° 22' 46.7400" W |
| Driving Directions | Google Maps |
| Area Code(s) | 218 |
| Can be seen from road? | No |
| Is marker in the median? | No |
| Which side of the road? | Marker is on the right when traveling North |
| Closest Postal Address | At or near , Two Harbors MN 55616, US |
| Alternative Maps | Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap |
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