This is an Earthcache. There is no physical container at the posted coordinates, but rather a geological lesson for you to explore. Please review the information on the cache page, then make your way to Ground Zero to make your observations and answer the three questions below. Email your answers to the cache owner by clicking the "message this owner" button above, and once complete, you can log this cache.

Thanks and happy caching!

QUESTIONS

1. What might explain the contrast between the red patch of soil on the slope and the surrounding vegetation?

2. How might the underlying bedrock influence the reddish coloration of the soil on the slope, and what does this suggest about the mineral composition of the area?

3. In what ways could the bedrock permeability and interaction with groundwater contribute to the visible soil and sediment distribution near the water body?

(Required) Post a picture of yourself with the oxidized iron in the background.

Welcome to Mylan Park, home of GeoWoodstock XXI. This is an expansive park with a lot of unique offerings and recreational opportunities. This Earthcache will invite you to explore the hiking and running trails surrounding the back half of the park. Along the way, stop to check out this unique geological formation. Just a short stretch uphill from the large pond, a unique geological phenomenon of bedrock and social has created an exciting geological lesson for you to explore. Please visit ground zero, take a picture at the location, and answer the three questions above. Some of the reading material below will help. 

The Role of Bedrock

The bedrock beneath the soil is the foundation of its characteristics. When the bedrock contains minerals rich in iron, such as hematite or magnetite, these minerals can break down over time through weathering. The breakdown releases iron, which then interacts with the environment to form iron oxides, giving the soil its red color.

Weathering of Minerals

Weathering is a natural process where rocks are broken down into smaller particles due to exposure to air, water, and changing temperatures. Chemical weathering, in particular, plays a major role in forming red soils. Iron-bearing minerals in the bedrock react with oxygen in the air or water to produce iron oxides, much like how metal rusts when exposed to moisture.

Oxidation and Iron Oxides

The reddish hue is primarily due to oxidation. When iron from the bedrock is exposed to oxygen, it forms compounds like hematite and goethite. These compounds are stable in the Earth's surface environment and create the vivid red and yellow hues commonly seen in soils.

Environmental Conditions

The process of oxidation and soil formation is influenced by the climate and environment. Warm and moist climates accelerate chemical weathering, making it easier for iron-rich minerals to break down and oxidize. Alternating wet and dry cycles, such as those in semi-humid regions, can also enhance the formation of red soils by repeatedly exposing minerals to oxygen and moisture.

Soil Permeability and Groundwater

The permeability of the soil and underlying bedrock also plays a role. If the bedrock allows water to flow through it, minerals can leech out and interact with groundwater. This groundwater can carry dissolved iron and deposit it closer to the surface, contributing to the soil’s red coloration. The water body in the image may act as a local reservoir that facilitates these processes.

Sediment Deposition

In some cases, red soils can also form from sediments deposited by rivers or lakes. These sediments may already contain iron-rich particles from upstream erosion. Over time, as the sediments are exposed to air and water, oxidation can occur, further enhancing the red coloration.

Vegetation and Organic Matter

Although vegetation does not directly cause the red coloration, it plays an indirect role. Plants can stabilize the soil, preventing erosion and allowing chemical weathering to continue. Decomposing organic matter can also create acidic conditions that help break down minerals in the soil, promoting oxidation.

Regional Geology

The specific geological history of an area influences the formation of red soils. For example, areas with volcanic activity often have iron-rich rocks that can weather into red soils. Similarly, ancient sedimentary basins with iron-rich layers may also contribute to the phenomenon. In north-central West Virginia, the bedrock consists primarily of sedimentary rock layers, including sandstones, shales, and limestones, formed during the Paleozoic Era. These layers often contain iron-rich minerals that weather over time, contributing to the reddish hues in soils. The region’s geological history, characterized by periods of marine deposition and terrestrial erosion, has shaped the composition of the bedrock and the soils above it.