{ "title": "Dunes and Inverted Craters in Arabia Terra", "authors": "HiRISE", "metadata": { "thumbnailURL": "https://static.uahirise.org/anews/2020-07-24/ESP_016459_1830.jpg", "excerpt": "This image shows dark sand dunes and inverted craters in the Arabia Terra region of Mars." }, "version": "1.5", "identifier": "ESP_016459_1830", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: 24 July 2020" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "Dunes and Inverted Craters in Arabia Terra" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "Our cutout shows one of the inverted craters surrounded by the dark dunes. Less than 1 km across. (NASA/JPL/UArizona)", "URL": "https://static.uahirise.org/anews/2020-07-24/ESP_016459_1830.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "
The sand in this image is dark because it was probably derived from basalt, a black volcanic rock that is common on Mars. Unlike traditional craters that are depressions, those here stick up above the surrounding plains. Such “inverted topography” is found on Mars and Earth where erosion has stripped away surrounding topography.
In this case, the craters were filled with sediment. Subsequent erosion stripped away the terrain around the filled craters, leaving the inverted topography visible here. Our cutout shows one of the inverted craters surrounded by the dark dunes.
ID: ESP_016459_1830
date: 29 January 2010
altitude: 272 km
NASA/JPL/UArizona