Images

An aerial view of coastal marshes along Bayou Dufrene, southwest of the town of Dulac in Louisiana's Terrebonne Basin.

Wrack deposits on the side of a levee near Golden Meadow, La.

Brown Marsh observed in southeastern Terrebonne Basin, La

English Turn Cemetery in English Turn, La., was in disarray after Hurricane Isaac.

Flooding near the community of Braithwaite, La.

Brown Marsh observed in southeastern Terrebonne Basin, La.

Hurricane Isaac effects in Upper Breton Sound, La., including removed vegetation, wrack deposits and channels created or expanded by Isaac’s surge.

Brown Marsh observed in southeastern Terrebonne Basin, La

A 3-D terrestrial LiDAR scan of the Percy Quin Mississippi State Park Dam in McComb, Mississippi, taken Monday, September 3, 2012. The U.S. Geological Survey is using this new technology in select areas of Louisiana, Mississippi and Alabama to map impacts by Hurricane Isaac.

USGS employee Anthony Lopez views the Atlantic City skyline while collecting sediment samples in the Edwin B. Forsythe National Wildlife Refuge in Galloway Township, NJ.

Breaking ice in the Arctic ocean with the Canadian ice breaker Louis St. Laurent out in front. Taken atop the bridge over the bow of the Coast Guard Cutter Healy

A 3-D terrestrial lidar scan of the Interstate-510 bridge in New Orleans taken Friday (Aug. 31, 2012). The U.S. Geological Survey is using this new technology in select areas of Louisiana, Mississippi and Alabama to map flooding in urban areas impacted by Hurricane Isaac.

Mylonitic breccia in alluvium of Little Deer Creek, downstream from a moderately west-dipping contact between biotitic quartzite of the Gunsight Formation, which is structurally overlain by garnet-chloritoid-bearing banded siltite of the banded siltite unit of the Apple Creek Formation.

Small-scale syncline in siltite of banded siltite unit of Apple Creek Formation, within a zone of tight, north-plunging chevron folds, exposed on the south-facing slope above the upper part of Little Deer Creek, east of the Blackbird cobalt-copper mine area, in east-central Idaho.

Outcrop of biotitic meta-sandstone in the lower part of the Gunsight Formation, cut by white quartz veins with alteration envelopes of coarsely crystalline black biotite and minor muscovite. USGS intern, Shane Kostka prepares to collect representative samples from this outcrop.

Limonite-stained outcrop of the banded siltite unit of the Apple Creek Formation, near Blackbird Creek, south of the Blackbird cobalt-copper mine area, in the Salmon River Mountains of east-central Idaho.

Outcrop of the banded siltite unit of the Apple Creek Formation of the Lemhi Group, in the Lemhi sub-basin of the Mesoproterozoic Belt Basin. This exposure is along the Deep Creek road, southeast of the Blackbird cobalt-copper mine area, in the Salmon River Mountains of east-central Idaho.

A thick lens of biotite-rich rock, interlayered with thick beds of cross-bedded meta-sandstone + scapolite of the Gunsight Formation of the Lemhi Group in the Lemhi sub-basin of the Mesoproterozoic Belt Basin. The biotite-rich rock is exposed in a prospect pit above the Sweet Repose mine adit.

Quartz vein in biotite-rich rock in the Gunsight Formation of the Mesoproterozoic Lemhi Group. Bluish green copper-bearing minerals coat the quartz vein. Pale pinkish cobalt bloom and white caliche coat adjacent biotite-rich wallrock.

Cross-bedded sandstone of the Gunsight Formation of the Mesoproterozoic Lemhi Group. These beds are interpreted as products of alluvial sedimentation in a deltaic setting.

Blocks of biotitic meta-sandstone from the lower part of the Gunsight Formation, and drill core from the underlying banded siltite unit of the Apple Creek Formation, lying on the dump of the lower workings of the Copper Queen mine, southeast of the Blackbird cobalt-copper mine area.