Chihuahuan Desert Nature Park
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Two Volcanoes at the Nature Park

knoll
 

 

This hill (right) is the eroded remnant of a volcano that formed about 45 million years ago. The lava flows and mudflows that resulted from this volcano are collectively called the Palm Park Formation. The dark gray angular rocks in the hill are andesite.

 

 

volcanic dike
 

 

This volcano (left) was active approximately 35 million years ago. After erupting, the remaining dense magma intruded into cracks in the earlier Palm Park lava. Over time, the surrounding softer rock weathered, eroded, and washed away, leaving a volcanic dike, a linear projection of hard rock seen in the photo above. This dike is Doña Ana monzonite, a type of granite.

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