Introduction: The dichotomy boundary represents one of the most important geological and geophysical features of Mars. We have been assessing the nature of modification processes along the dichotomy boundary at northern mid-latitudes in the Deuteronilus-Protonilus region and have found evidence for extensive regional Amazonian glaciation in lobate debris aprons (LDA) and lineated valley fill (L...

Introduction: The dichotomy boundary represents a fundamental transition between the northern lowlands and southern uplands. The most well-defined portion of the boundary occurs as a complex set of scarps and reentrants where the boundary extends into northern mid-latitudes (~25-47°N), between 0° and 80°E. A considerable portion of the boundary (northern part of Arabia Terra) is comprised of we...

Introduction: Mamers Valles is a fretted valley along the dichotomy boundary in the Deuteronilus Men-sae region of Mars (Fig. 1). Analyses of Mamers Valles from Viking images [1-2] characterized it as a fretted channel filled with textured terrain. The channel is interpreted to have formed in the Early Hesperian or earlier [3-4], however, the terrain filling the valley is recent, as young as La...

Presented in this paper is an experimental study on scour downstream of rough and smooth stiff aprons under the influence wall jets. The effect various parameters asymptotic depth studied. analysis data reveals that maximum reduces with increasing sediment size, sluice opening, apron length. It directly proportional to densimetric Froude number. Maximum equilibrium initially decreases tailwater...

a r t i c l e i n f o Keywords: Mars lobate debris aprons lineated valley fill debris-covered glaciers glaciation rock glaciers Lobate debris aprons (LDA) and lineated valley fill (LVF) have been known to characterize the mid-latitude regions of Mars since documented by Viking; their flow-like character suggested that deposition of ice in talus pile pore space caused lubrication and flow during...

Introduction: Fretted terrain and fretted channels are very well developed in the northern part of Arabia Terra [1] and are the site of development of lineated valley fill (LVF) and lobate debris aprons (LDA) [2-3]. The detailed geological history and chronology of this region provide [4] a framework for the interpretation of modification processes operating on and near the dichotomy boundary. ...