223 datasets found

Mountain glaciers are one of the most reliable climatic proxy on Earth through their rapid response to slight changes in forcing and their wide distribution. For these...

The complexity of the climate system means that for the reconstruction of past variations, the use of a multiplicity of proxy indicators is mandatory. Polar ice cores...

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International audience

Guide pour une excursion géologique.

International audience

Extracted air from polar ices of Greenland and Antarctica constitute a real archive of the past atmospheres of our planet. The aim of this study was to understand the...

Independently of their underlying basement, the superficial formations of Gabon display a constant organization, showing the superposition of two units: (i) a lower...

N° Outcrop: B000101. A typical profile showing from the bottom to the top: * The altered basement (Paleoproterozoic paragneisses); * The Stone Line; * The Cover...

N° Outcrop: B000101. Detailed view of the Stone Line. Note the presence of jasper fragments in the upper left part of the photograph.

N° Outcrop: B000101. Detailed view showing a well-rounded quartz pebble (upper centre).

N° Outcrop: B000101. Same comment as preceding. Four samples have been collected in the Cover Horizon on this outcrop (plastic bags).

N° Outcrop: B000101. Detailed view showing jasper fragments. Note the angular to more or less rounded shape of the quartz fragments.

N° Outcrop: B000101. View of the Stone Line showing jasper fragments and well-rounded quartz pebble at all levels of the profile.

N° Outcrop: B000102. General view of the point where the Stone Line becomes thick and stratified.

N° Outcrop: B000102. View of the thick and stratified Stone Line with a very large rounded block of quartz toward its base.

N° Outcrop: B000102. Walking toward the top of the Stone Line. On the right, a gentle slope leads to the top of a low hill ~ 40 m above the Ogooué river.

N° Outcrop: B000102. View of quartz blocks of all sizes (Stone Line surface) covering the hill to the north side of the road, about 40 m above the Ogooué river.

N° Outcrop: B000102. View of the landscape to the south of the BOO0102 outcrop showing unforested mountains of the Lopé - Okanda massif . In our back, the Ogooué...