Aeolian features on Venus: Preliminary Magellan results

Magellan synthetic aperture radar data reveal numerous surface features that are attributed to aeolian, or wind processes. Wind streaks are the most common aeolian feature. They consist of radar backscatter patterns that are high, low, or mixed in relation to the surface on which they occur. A data base of more than 3400 wind streaks shows that low backscatter linear forms (long, narrow streaks) are the most common and that most streaks occur between 17°S to 30°S and 5°N to 53°N on smooth plains. Moreover, most streaks are associated with deposits from certain impact craters and some tectonically deformed terrains. We infer that both of these geological settings provide fine particulate material that can be entrained by the low-velocity winds on Venus. Turbulence and wind patterns generated by the topographic features with which many streaks are associated can account for differences in particle distributions and in the patterns of the wind streaks. Thus, some high backscatter streaks are considered to be zones that are swept free of sedimentary particles to expose rough bedrock; other high backscatter streaks may be lag deposits of dense materials from which low-density grains have been removed (dense materials such as ilmenite or pyrite have dielectric properties that would produce high backscatter patterns). Wind streaks generally occur on slopes < 2° and tend to be oriented toward the equator, consistent with the Hadley model of atmospheric circulation. In addition to wind streaks, other aeolian features on Venus include yardangs(?) and dune fields. The Aglaonice dune field, centered at 25°S, 340°E, covers ∼1290 km^2 and is located in an ejecta flow channel from the Aglaonice impact crater. The Meshkenet dune field, located at 67°N, 90°E, covers ∼17,120 km^2 in a valley between Ishtar Terra and Meshkenet Tessera. Wind streaks associated with both dune fields suggest that the dunes are of transverse forms in which the dune crests are perpendicular to the prevailing winds. Dunes on Venus signal the presence of sand-size (∼60 to 2,000 μm) grains. The possible yardangs are found at 9°N, 60.5°E, about 300 km southeast of the crater Mead. Although most aeolian features are concentrated in smooth plains near the equator, the occurrence of wind streaks is widespread, and some have been found at all latitudes and elevations. They demonstrate that aeolian processes operate widely on Venus. The intensity of wind erosion and deposits, however, varies with locality and is dependent on the wind regime and supply of particles

Une remise d'impôts en 216 ap. J.-C.

Thouvenot Raymond. Une remise d'impôts en 216 ap. J.-C.. In: Comptes rendus des séances de l'Académie des Inscriptions et Belles-Lettres, 90ᵉ année, N. 4, 1946. pp. 548-558

J.-P. Brisson, Autonomisme et christianisme dans l'Afrique romaine, de Septime- Sévère à l'invasion vandale, 1958

Thouvenot Raymond. J.-P. Brisson, Autonomisme et christianisme dans l'Afrique romaine, de Septime- Sévère à l'invasion vandale, 1958. In: Revue des Études Anciennes. Tome 62, 1960, n°1-2. pp. 230-232

Tadéusz Kotula, Note bibliographique complémentaire sur l'Afrique du Nord aux IVe et Ve siècles (Bulletin d'Archéologie algérienne, t. II, 1966-1967)

Thouvenot Raymond. Tadéusz Kotula, Note bibliographique complémentaire sur l'Afrique du Nord aux IVe et Ve siècles (Bulletin d'Archéologie algérienne, t. II, 1966-1967). In: Revue des Études Anciennes. Tome 70, 1968, n°3-4. pp. 525-526

La route romaine de Salé à l'Oued Beth (zone française du Maroc)

Thouvenot Raymond. La route romaine de Salé à l'Oued Beth (zone française du Maroc). In: Comptes rendus des séances de l'Académie des Inscriptions et Belles-Lettres, 100ᵉ année, N. 1, 1956. pp. 120-125

« Omenaje al profesor J. de M. Carriazo »

Thouvenot Raymond. « Omenaje al profesor J. de M. Carriazo ». In: Cahiers de civilisation médiévale, 17e année (n°68), Octobre-décembre 1974. p. 393

Karthago. Revue trimestrielle d'archéologie africaine, IV, 1953

Thouvenot Raymond. Karthago. Revue trimestrielle d'archéologie africaine, IV, 1953. In: Revue des Études Anciennes. Tome 57, 1955, n°1-2. pp. 225-226

Pietro Romanelli, Storia delle Province Romane dell'Africa (Studi pubblicati dell'Istituto Italiano per la storia antica, fascicolo XIV), 1959

Thouvenot Raymond. Pietro Romanelli, Storia delle Province Romane dell'Africa (Studi pubblicati dell'Istituto Italiano per la storia antica, fascicolo XIV), 1959. In: Revue des Études Anciennes. Tome 62, 1960, n°1-2. pp. 220-221

Tadeuz Kotula, Les origines des assemblées provinciales dans l'Afrique romaine.(Eos, LII, 1962, 1, p. 147-168) ; Id., En marge de l'usurpation africaine de L. Domitius Alexander (Klio, Beiträge zur alten Geschichte, XL, 1962, p. 159-178)

Thouvenot Raymond. Tadeuz Kotula, Les origines des assemblées provinciales dans l'Afrique romaine.(Eos, LII, 1962, 1, p. 147-168) ; Id., En marge de l'usurpation africaine de L. Domitius Alexander (Klio, Beiträge zur alten Geschichte, XL, 1962, p. 159-178). In: Revue des Études Anciennes. Tome 66, 1964, n°3-4. pp. 495-496

Madeleine Hours-Miedon, Carthage (Collection Que sais-je ? n°340), 1949

Thouvenot Raymond. Madeleine Hours-Miedon, Carthage (Collection Que sais-je ? n°340), 1949. In: Revue des Études Anciennes. Tome 52, 1950, n°1-2. pp. 177-178