This Earthcache is based on pink-colored Pikes Peak Granite that has been broken down into scree.
About one billion years ago, an immense dome of hot molten rock called magma pushed up from the earth’s core to form what geologists call a batholith. This formation never made it to the surface, but rather remained hidden in the earth’s crust for millions of years, about 20 miles down. Pikes Peak batholith is about 1300 square miles in size. Igneous rock is formed from this magma that has cooled and become solid. Molten rock is extraordinarily hot, sometimes exceeding 2,000 degrees Fahrenheit. This molten and partially crystallized material (magma) crystallizes underground before it reaches the surface, this rock is plutonic. The formation of the Rocky Mountains followed in three relatively recent stages. The first stage was the creation of what geologists call the Ancestral Rockies.
This is when the earth’s crust went through some rather intensive sea floor spreading at the mid-Atlantic Ridge. It was unable to absorb the crust as fast as it was being created, so the stresses on the North American plate were too high and the crust faulted along what is now the same area as the Rocky Mountains. It was at this time that the huge mass of the Rocky Mountains first surfaced.
Afterwards, the Ancestral Rockies experienced a period of great erosion which virtually leveled the mountains. The debris from this erosion survives in some of the red sedimentary rocks of the area. After a period of time when the seawater and additional sedimentary rock covered the area, another up-thrust of the earth’s crust formed the present range of the Rocky Mountains and along with it, pushed up the sunken batholith and the surrounding mountains. These mountains are made entirely of pink granite.
Pikes Peak Granite is made up mostly of milky and smoke quartz, pink feldspar and silver or golden to black micas. The feldspar and mica weathers easily. The pink-colored Pikes Peak Granite makes up most of the rocky cañon in this area. It has many joints and fractures. Water gets into cracks in the rocks and it easily crumbles into gravel sized pieces. When the water freezes, it expands and forces the cracks to open wider. For millions of years this freezing and thawing of water has caused the Pikes Peak Granite to break down into a collection of broken rock fragments known as scree.
To receive credit for this Earthcache, you must answer the following questions:
1) Examine the granite under your feet, do you think this elevation made a difference on how the rock fragments were made?
At the higher elevations, where the colder temperatures keep the water from seeping in as deeply as lower elevations, the rock is broken down into much smaller pieces. So, as you travel higher on the mountain, you’ll likely begin to see much smaller rocks. After millenniums of this freezing and thawing, the rocks eventually break down into soil components.
2) You are standing on an old road, do you think this scree came from this mountain? Why or why not?
Reach down and scoop up a handful of scree and examine the size and contents of the material. Now walk to the Bottom of Mays Peak (Reference Point MP) and compare.
3) Looking at the rocks at Reference Point MP, what colors do you see?
Standing at the coordinates for Reference Point MP examine the rocks at your feet and tell me what colors you see.
Please send me the answers to these questions at the same time you log this Earthcache. If there is an issue I will contact you.
(Optional) Pictures are not required, but welcome. They are a great way show others where you have been and what to expect before arriving. Please post a picture of yourself or any landscape near one or all of the waypoints listed below.
Permission was granted by Jeff Hovermale, Lands and Minerals Staff Officer Forest Service. Pike National Forest, Pikes Peak Ranger District.
Additional Waypoints
MP7Z1FA - Bottom of Mays Peak
N 38° 48.049 W 104° 53.937
Final Waypoint - You can climb up towards Mays Peak to see a mountain of scree.
PK7Z1FA - Upper Gold Camp Parking Lot
N 38° 47.433 W 104° 54.231
Upper Gold Camp Parking Lot
TH7Z1FA - High Drive
N 38° 47.419 W 104° 54.208
Old High Drive Road
V17Z1FA - High Drive Viewpoint
N 38° 47.573 W 104° 53.961
This is a great place to take a few pictures of Mays Peak and make sure you are on the correct trail.