Flat Floored Crater Example

Complex craters start to form on the moon for diameters around 15 20 km e g howard 1974.

Flat floored crater example. Smooth areas s are probably filled with wind or water transported sediment as the the flat floored crater f. Its low rim is composed of loose pieces of basaltic lava and wallrocks sandstone shale limestone of the underlying diatreme as well as random chunks of ancient crystalline. Central peak crater c. The crater still looks weird.

Lofn is a large relatively young impact crater on jupiter s galilean satellite callisto it was identified in 1997 and named after the goddess of marriage in norse mythology located near the south pole of this moon lofn is classified as a flat floored or anomalous dome impact crater it is superimposed on adlinda multilayer structure obscuring about 30 of it. Due to the cratering process itself and due to postimpact modification. Over the next 300 000 years the wind gradually filled it with sand and today the crater floor is 60 meters 200 feet below the rim which rises 25 meters above the surrounding flat desert land. Such postimpact modification can include regolith transported down the crater walls and onto the floor infilling by aeolian or lacustrine material or infilling by lava unrelated to the impact process e g plato flooding of the crater by lavas e g schultz 1976a.

Complex craters are characterized by a central uplift a flat floor and inward collapse around the rim see figure 3. An excellent example of a maar is zuni salt lake in new mexico a shallow saline lake that occupies a flat floored crater about 6 500 ft 2 000 m across and 400 ft 120 m deep. This is another close up of part of the first image in this section showing flat floored craters f smooth s and dissected d intercrater plains. Such flat floors extend across the entire reach of the crater bottom or can be interrupted at the center by a central peak or peak ring.

Flat floored craters occur in complex craters or highly degraded or modified simple craters. On earth the diameter of complex impact craters is larger to about 2 to 4 km grieve 1987. The image above shows a region 10 in every direction centered on 10 s latitude and 20 w longitude. An excellent example of a maar is zuni salt lake in new mexico a shallow saline lake that occupies a flat floored crater about 6 500 feet across and 400 feet deep.

The crater that was left was probably about 120 meters deep. Its low rim is composed of loose pieces of basaltic lava and wall rocks sandstone shale limestone of the underlying diatreme as well as random chunks of. Flat floored craters occur for two reasons. This is an example of what s called impact melt when an asteroid or comet slams into the surface with so much energy it melts the material around it.

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