Add to Lightbox
El Capitan, Gudalupe Mountains National Park, Texas, USA. This capitan limestone peak is part of a Permian marine reef that is known for its fossil deposits.
Richard Thom/Visuals Unlimited, Inc.
all images © Visuals Unlimited
Visuals Unlimited, Inc. specializes in, microscopy, healthcare, medical, wildlife, underwater, agriculture, and science stock photography.