{ "title": "A Light Outcrop on a Crater’s Floor", "authors": "HiRISE", "metadata": { "thumbnailURL": "bundle://header.jpg", "excerpt": "This light-toned material appears fractured at several different scales. These fractures are called joints, and result from stresses on the rock after their formation." }, "version": "1.5", "identifier": "PSP_001860_1685", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: MONDAY, 6 JANUARY 2020" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "A Light Outcrop on a Crater’s Floor" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "An enhanced color cutout showing the bright bedrock and plenty of sand. Less than 1 km across. (NASA/JPL/University of Arizona)", "URL": "bundle://PSP_001860_1685-main-01-06.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "


This observation shows part of the floor of a large impact crater in the southern highlands, north of the giant Hellas impact basin. Most of the crater floor is dark, with abundant small ripples of wind-blown material. However, a pit in the floor of the crater has exposed light-toned, fractured rock.

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The light-toned material appears fractured at several different scales. These fractures are called joints, and result from stresses on the rock after their formation.

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Joints are similar to faults, but have undergone virtually no displacement. With careful analysis, joints can provide insight into the forces that have affected a unit of rock, and thus into its geologic history. The fractures appear dark; this may be due to trapping of dark, wind-blown sand in the crack, to precipitation of different minerals along the fracture, or both.

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ID: PSP_001860_1685
date: 19 December 2006
altitude: 259 km

NASA/JPL/UArizona

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