Rock magnetic properties and radiocarbon dates of samples obtained on Ile de Possession, South Indian Ocean

A 6200 year old peat sequence, cored in a volcanic crater on the sub-Antarctic Ile de la Possession (Iles Crozet), has been investigated, based on a multi-proxy approach. The methods applied are macrobotanical (mosses, seeds and fruits) and diatom analyses, complemented by geochemical (Rock-Eval6) and rock magnetic measurements. The chronology of the core is based on 5 radiocarbon dates. When combining all the proxy data the following changes could be inferred. From the onset of the peat formation (6200 cal yr BP) until ca. 5550 cal yr BP, biological production was high and climatic conditions must have been relatively warm. At ca. 5550 cal yr BP a shift to low biological production occurred, lasting until ca. 4600 cal yr BP. During this period the organic matter is well preserved, pointing to a cold and/or wet environment. At ca. 4600 cal yr BP, biological production increased again. From ca. 4600 cal yr BP until ca. 4100 cal yr BP a 'hollow and hummock' micro topography developed at the peat surface, resulting in the presence of a mixture of wetter and drier species in the macrobotanical record. After ca. 4100 cal yr BP, the wet species disappear and a generally drier, acidic bog came into existence. A major shift in all the proxy data is observed at ca. 2800 cal yr BP, pointing to wetter and especially windier climatic conditions on the island probably caused by an intensification and/or latitudinal shift of the southern westerly belt. Caused by a stronger wind regime, erosion of the peat surface occurred at that time and a lake was formed in the peat deposits of the crater, which is still present today.

LiDAR elevation data of Yukon Coast and Herschel Island in 2012 and 2013

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Providence, Rhode Island, 1857 (Raster Image)

This layer is a georeferenced raster image of the historic paper map entitled: Map of the city of Providence, Rhode Island, from surveys under the direction of H.F. Walling ; engraved, printed, compiled & mounted at H.F. Walling's Map Establishment, no. 90 Fulton St., New York. It was published by F.A. Baker in 1857. Scale [1:4,200]. Covers a portion of East Providence, Rhode Island.The image inside the map neatline is georeferenced to the surface of the earth and fit to the Rhode Island NAD 1983 coordinate system (in Feet) (Fipszone 3800) coordinate system. All map collar and inset information is also available as part of the raster image, including any inset maps, profiles, statistical tables, directories, text, illustrations, index maps, legends, or other information associated with the principal map. This map shows features such as roads, railroads, railroad stations, drainage, public buildings, schools, churches, cemeteries, industry locations (e.g. mills, factories, etc.), docks and wharves, private buildings with selected names of property owners, town district boundaries, and more. Relief shown by hachures. Includes also illustrations of buildings in upper and lower margins: New Custom House, Post Office and U.S. court rooms -- Brown University -- Providence Institution for Savings -- Butler Hospital for the Insane -- First Baptist Meeting House -- Grace Church -- General railroad passenger station -- Central Congregational Church -- Providence Athenaeum -- Central Baptist Church.This layer is part of a selection of digitally scanned and georeferenced historic maps from the Harvard Map Collection. These maps typically portray both natural and manmade features. The selection represents a range of originators, ground condition dates, scales, and map purposes.

York Township (Mich.) residences and business, ca. 1874

Left to right: Res. of Geo. F. Richards, Sec. 16, York Tp. Mich.; Res. of Selden Orr, Sec. 16, York Tp. Mich.; Res. of John Coe, Sec. 3, York Tp. Mich.; Res. of E. Pearson, Sec. 11, York Tp. Mich.; Res. of Geo. Coe, Sec. 8, York Tp. Mich.; Milan House, Lyman Burnham, Proprietor, Milan, York Tp. Mich. Publication information: Chicago, Ill. : Everts & Stewart, 1874.

Top: Res. of Asa M. Darling, Sec. 12, Augusta Tp. Mich. Bottom: Res. of C.C. Harmon, Sec 18, Augusta Tp. Mich.

Augusta Township (Mich.) residences. Insets: Built 1849. Hop House. Publication information: Chicago, Ill. : Everts & Stewart, 1874.

President's house and yard

On verso: Views on the campus at the U. of M. Ann Arbor Mich. [Photo ... by Black & Co.]

President's House

On verso: Photographed in 1887 by A.L. Colton of '89

Prof's House, North University, West Residence

Originally West Professor's house on North University. Became Homeopathic Hospital. Wing added in rear of building in 1879. School of Dentistry 1875-1877. Psychological Lab 1903-1914. Building razed in 1914. On verso: Rear view, taken from campus side, looking across North University, where on the left-hand side ... Octagonal House, long owned by Alexander Winchell ... now site of Hill Auditorium ... taken before rear wing added to make it into the Homepathic Hospital.