EMAIL THE ANSWERS TO CLAIM THIS CACHE
1.What is the Difference between the types of rock can be found here ?
2. What do you think caused the boulders to take this form ?
3. Estimate the size of the Boulder field .
4. What's the Elevation here ? Look to the Ridges can you estimate the difference in Elevation ?
5.PLEASE POST A post a picture OF YOU OR A PERSONNAL ITEM somewhere on the rocks.
The study of geology is interesting and there are many fine examples of Mountain Building in the State of Pennsylvania. The evidence of plate tectonics was largely accepted as explaining mountain building, sea-floor spreading and volcanism. In Pennsylvania, the geological history of our state includes several mountain-building episodes, of which, our Appalachian mountains are the last remnants of those ancient times.
This is a boulder field of large angular rocks. The field contains boulders of Sandstone and Conglomerate rock from the Shawangunk Formation (Silurian age), and occupies a relatively flat area in the center this wind gap in the Blue Mountain. A wind gap is a major cut through a ridge which no river flows. Because this area is lower then the 2 ridges on either side during glacial times repeated breakup of the rock by frost action on these nearby ridges resulted in a pile of angular boulders at the base; continued movement during glacial time to where they rest today has caused the boulders to become semirounded.
REFERENCE: Miller, B. L., Frazer, D. M., and Miller, R. L. [1939], Northampton County, Pennsylvania, Pennsylvania Geological Survey, 4th ser., County Report 48, 496 p.
Â
| I have earned GSA's highest level: |
 |
