As I was driving this dirt road I noticed that it wasn't really dirt, but mostly made up of solid rock with some dirt on top. There are 3 main types of rock that make up this planet we call Earth. They are Igneous Rocks, Sedimentary Rocks and Metamorphic Rocks. Here at the posted coords we have all three.
Igneous Rocks
Igneous rocks are crystalline solids which form directly from the cooling of magma. This is an exothermic process (it loses heat) and involves a phase change from the liquid to the solid state. The earth is made of igneous rock - at least at the surface where our planet is exposed to the coldness of space. Igneous rocks are given names based upon two things: composition (what they are made of) and texture (how big the crystals are).
Sedimentary Rocks
In most places on the surface, the igneous rocks which make up the majority of the crust are covered by a thin veneer of loose sediment, and the rock which is made as layers of this debris get compacted and cemented together. Sedimentary rocks are called secondary, because they are often the result of the accumulation of small pieces broken off of pre-existing rocks. There are three main types of sedimentary rocks:
Clastic: your basic sedimentary rock. Clastic sedimentary rocks are accumulations of clasts: little pieces of broken up rock which have piled up and been "lithified" by compaction and cementation.
Chemical: many of these form when standing water evaporates, leaving dissolved minerals behind. These are very common in arid lands, where seasonal "playa lakes" occur in closed depressions. Thick deposits of salt and gypsum can form due to repeated flooding and evaporation over long periods of time.
Organic: any accumulation of sedimentary debris caused by organic processes. Many animals use calcium for shells, bones, and teeth. These bits of calcium can pile up on the seafloor and accumulate into a thick enough layer to form an "organic" sedimentary rock.
Metamorphic Rocks
The metamorphics get their name from "meta" (change) and "morph" (form). Any rock can become a metamorphic rock. All that is required is for the rock to be moved into an environment in which the minerals which make up the rock become unstable and out of equilibrium with the new environmental conditions. In most cases, this involves burial which leads to a rise in temperature and pressure. The metamorphic changes in the minerals always move in a direction designed to restore equilibrium. Common metamorphic rocks include slate, schist, gneiss, and marble.
Once you get to the spot you will notice the rock making up the road. You will have to answer some questions to claim this as found.
Please email me with the answers to the following questions. Include the name of this cache and the number of people in your group.
#1. Based on your reading and what you see onsite, which kind of rock is the roadway made from?
#2. What color is the rock?
#3. Does the grain of the rock run with or against the road?
#4. On the side of the road there are some rocks built up above the roadway. What color are they?
Go to N 38 30.619 W 121 02.930. This is another rocky part of the road.
#5. Which way does the grain run here?
(optional) Please post a picture of yourself in the area.
Any found logs without an accompanying e-mail will be deleted without warning.
