Trans Pecos

By: Grant, Kaitlyn, Zoe & Tyler


The Trans Pecos ecoregion is known as "Far West Texas". It is the part of Texas, west of the Pecos river. It is apart of the Chihuahuan desert, the largest desert in North America. It has the most mountains, and is the driest part of Texas. Trans Pecos is best known for Big Bend. The region is 2,500-8,749 feet above sea level.

Biotic & Abiotic Factors

Biotic: Biotic factors in this ecoregion include oak and hickory trees, yucca plants, cactus & Jinuper. Animals include butterflies, scorpions, butterflies, ants, big horn sheep, lizards & snakes.

Abiotic Factors: Soil, rocks, water & wind.


In Trans Pecos the temperatures usually are very hot for most of the year. The average amount of rainfall is less than 12 inches per year. Sometimes tropical storms from the Gulf make it to the region giving it some rain. Elevation ranges 3,200 to 5,200 feet above sea level.

Industry & Agriculture

Industries in Trans Pecos mostly include oil. Their are oil fields scattered all around the region. Their are also numerous mineral depositions throughout the area. Tourism is also a very big industry. Tourists go to places such as Big Bend or Marfa where their is a festival of music and love every year. Agriculture includes many crops such as corn, beans, squash, tobacco & cotton.

Cities & Towns

Towns include El Paso, Marfa, Lajitas & Aloine.

Deposition, Weathering & Erosion

Deposition- after weathering/erosion of the Guadalupe and Davis Mountains has formed the soil in this region.

Erosion- In the Chihuhaun Desert wind acts as the main erosion agent, creating sand dunes. When this eco region does receive rain it can lead to flash floods.

Weathering. Most weathering in this region is mostly due to wind. The wind chips pieces of of rocks and blow them to different places. Another factor is water. Sediment is put into water where it is broken down and deposited some where else.