{ "title": "A Distal Fan ", "authors": "HiRISE", "metadata": { "thumbnailURL": "bundle://header.jpg", "excerpt": "These alluvial deposits are made of materials that were more resistant to erosion over time, which is why they appear higher-standing than the rest of the material on this crater’s floor." }, "version": "1.5", "identifier": "ESP_055360_1520", "language": "en", "layout": { "columns": 10, "width": 1024, "margin": 85, "gutter": 20 }, "documentStyle": { "backgroundColor": "#faf7f2" }, "components": [ { "role": "heading1", "layout": "heading1Layout", "text": "HiPOD: TUESDAY, 18 FEBRUARY 2020" }, { "role": "divider", "layout": "bigDividerLayout", "stroke": { "width": 3, "color": "#8c2028" } }, { "role": "title", "layout": "halfMarginBelowLayout", "text": "A Distal Fan" }, { "role": "photo", "layout": "fullBleedLayout", "caption": "These formations are just gorgeous to look at, as they appear graceful and delicate. Less than 5 km across. (NASA/JPL/UArizona)", "URL": "bundle://ESP_055360_1520-main-02-18.jpg" }, { "role": "body", "format": "html", "layout": "hipodMarginLayout", "text": "
These formations are just gorgeous to look at, as they appear graceful and delicate. This observation captures a likely alluvial fan with inverted channels that might have actually flowed around that crater. The hypothesis is that embedded craters (like this one) show rims and inwardly-dipping (infilling) strata, and are superposed by alluvial fan strata. The deposits are made of materials that were more resistant to erosion over time, which is why they appear higher-standing than the rest of the crater floor.
Craters that are interbedded with fluvial/alluvial deposits may set a lower limit on the interval over which any runoff occurred. This remains an area of research about alluvial fans.
ID: ESP_055360_1520
date: 19 May 2018
altitude: 256 km
NASA/JPL/UArizona