Images

View of the Potomac River from a bank.  Across the river is a forest of trees shedding leaves.

A photomicrograph depicting the siliceous frustules of fifty species of diatoms arranged within a circular shape. The image has been inverted to white on black to bring out details. Diatoms form the base of many marine and aquatic foodchains and upon death, their glassy frustules form sediments known as diatomaceous earth.

View from the bank of a river. The variegated forest in the background indicates the fall season.

Grey Tree Frog

A photomicrograph depicting the calcium carbonate tests of ten species of marine foraminiferans. Upon death, their tests can form calcareous marine sediments known as foraminiferan ooze.

A photomicrograph depicting the calcium carbonate tests of ten species of marine foraminiferans. The image has been inverted to bring out details. Upon death, their tests can form calcareous marine sediments known as foraminiferan ooze.

Shenandoah River behind trees with mountains in the background.

Still relatively common in Louisiana, although amphibian declines are a global problem

Fall in Canyon de Chelly.

A group of juvenile lionfish, approximately 120 mm total length.

Adult lionfish, approximately 250 mm total length.

Limestone rocks are the primary bed of this flashy river.  Note the baldcypress tree in the background uprooted in a past flood.  View looking downstream. 

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spins are hollow and connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on it's back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

The saddleback caterpillar is about an inch long, has a purplish-brown body with a green saddle shape on its back, and has poisonous spines on four large projections (tubercles) and many smaller ones that stick out from the sides of its body. The poisonous spines are hollow and are connected to poison glands.

This native leafcutter bee, Trachusa zebratum, is a solitary bee species associated with sandy soils where the female builds her own nest to lay her eggs in.

Small waterfall at base of hill lined with trees and foliage alongside stream.

A river reflects the conifers and mountains beside it.