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Fossils, fern leaves
Fossils, fern leaves
Fossils, fern leaves
Fossils, Fucoids, Decorah Shales, etc.
Fossils, Fucoids, from St. Paul
Fossils, Fucoids, from St. Paul
Fossil, shells, Trenton Limestone
Fossil, shells, Trenton Limestone, close up
Fossils, Lignite coal, Chips from slump
Fossils, log with knot
Fossils, Ordorician Limestone, Brachipods and Bryozoans
Fossils, Ordorician Limestone, Brachipods and Bryozoans
Fossils, Ordorician Limestone, Brachipods and Bryozoans
Fossils, Ordorician Limestone, Brachipods and Bryozoans, near view
Fossils, shale beds, Twin City Brick Company
Fossils, Trilobites from the field
Fossils, Trilobites from the field, close up
Four by Four in Black
Four Mountain Plovers
Four Mountain Plovers
Four Mountain Plovers
Fradaria vesca americana
Franklin's spermophile
Fraxinus lanceolata leaf (above) and Fraxinus nigra leaf (below)
Fraxinus lanceolata leaf (above) and Fraxinus nigra leaf (below)
Fraxinus nigra leaf
Fraxinus pennsylvanica fruit
Fraxinus pennsylvanica leaf
Fraxinus pennsylvanica leaf
Fraxinus pennsylvanica leaves and fruit
Front of advancing dunes, movement checked
Front of large old dune near Elk River
Front of large old dune near Elk River, photograph of slope close up
Fruits of Acer sacchariunum and Acer saccharum
Fruits of Betula much englarged
Fruits of Gaillardia
Fruits of Physalis virginiana, Physalis alkekengi, and Leucophysalis grandiflora
Fruits of Staphylea
Fruits of Staphylea trifolia
Fruits of the Rhus glabra and Rhus typhina
Fruits with hooks
Fruits with hooks and spines
Fucus
Fucus bed, low tide
Fucus rockweed
Gabbro Portage, Hurd unloading the canoe
Galium boreale
Galium boreale
Galium triflorum (Galium asperuloides)
Gardiner Canyon and Eagles Nest crag at Yellowstone Park