Category
page 1Impact craters
impact crater
circular depression in a solid astronomical body formed by the impact of a smaller object
ray system
fine ejecta
palimpsest
type of crater whose relief has disappeared
crater counting
method for planetary surface chronology
Shatter cone
geological feature

Pseudotachylite
alt=|thumb|322x322px|Purple and green pseudotachylyte veins in outcrop (Sierra Nevada Mountains, California)
Pseudotachylyte (sometimes written as pseudotachylite) is an extremely fine-grained to glassy, dark, cohesive rock occurring as veins that form through frictional melting and subsequent quenching during earthquakes, large-scale landslides, and impacts events. Chemical composition of pseudotachylyte generally reflects the local bulk chemistry, though may skew to slightly more mafic compositions due to the preferential incorporation of hydrous and ferro-magnesian minerals (mica and amphib
secondary crater
impact crater formed by the ejecta that was thrown out of a larger crater
permanently shadowed crater
permanently shadowed region of a body in the Solar System
rim
inner edge of an impact crater that often extends above the local surface

complex crater
large impact crater morphology with uplifted centres
Crater depth
Depth of an impact crater
Multi-ringed basin
crater containing multiple concentric topographic rings