Ring-mold craters in lineated valley fill and lobate debris aprons on Mars: Evidence for subsurface glacial ice

Ring-mold craters in lineated valley fill and lobate debris aprons on Mars: Evidence for subsurface glacial ice

[1] Ring-mold craters (RMCs), concentric crater forms shaped like a truncated torus and named for their similarity to the cooking implement, are abundant in lobate debris aprons (LDA) and lineated valley fill (LVF) in the northern mid-latitudes on Mars, but are not seen in surrounding terrain. LDA and LVF have been interpreted to form by flow of debris, but uncertainty remains concerning the me...

Ring-mold Craters on Lineated Valley Fill (lvf) and Lobate Debris Aprons (lda) on Mars (ii): Implications for the Presence of Subsurface Ice

Ring-mold Craters on Lineated Valley Fill, Lobate Debris Aprons, and Concen- Tric Crater Fill on Mars: Implications for Near-surface Structure, Composi-

Introduction: Ring-mold craters [1] comprise a suite of craters with unusual morphologies that have as yet been identified only on lineated valley fill (LVF), lobate debris aprons (LDA), and concentric crater fill (CCF) in the northern and southern mid-latitudes of Mars. Ringmold craters (RMCs) are generally rimless and consist of an outer annular trough surrounding a variety of interior morpho...

Lineated Valley Fill and Lobate Debris Aprons in the Deuteronilus Mensae Region, Mars: Implications for Regional Glaciation

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...

Flow Patterns of Lobate Debris Aprons and Lineated Valley Fill North of Ismeniae

Introduction: Lobate debris aprons (LDA) and lineated valley fill (LVF) surrounding plateaus and isolated massifs have been documented in numerous locations in the northern mid-latitudes on Mars [1-8]. While there has been agreement that these features represent Amazonian-aged modification of the dichotomy boundary from ice-assisted debris flows [e.g., 9], the amount of ice and mode of origin o...