Lobachevskiy

D= 88 km
Center: 10°N, 113°E

Count Area: 1749 km^2
Observed Density (@ 1km): 16000 ± 3100
Age: 3.8 ± 0.1 (+sec: 3.8)
Stoffler epoch: Early Imbrian
Fit density (@ 1km): 18900 ± 2100
PF fit: good, larger ones slightly shallow

Age calculation notes:
~ good fit (SM).
good fit - use as is; adding OSs does not change fit or age (MRK).

USGS geology: 
All mapped as Late Imbrian crater material.

Wilhelms: 
Late Imbrian

Floor material: 
Best guess is original, but does look softened. Soft?

Geology Observations: 
Ejecta blanket visible, little erosion. Rim crest still sharp. Central peak moderate size, has eroded appearance, and is spread as collection of hills. Most of floor is smoother, hummocky areas near rim - collapses? (avoided). One or two large secondary clusters with various size craters observed (up to ~900 m).

SFD Observations: 
Dominated by class 3. Matches MPF. Distribution has steep portion for small (< 1.5 km) and shallow for large craters. Shallow "right ear" indicated by a few craters. Slope(Diff) = 3.9 ± 0.3.

Discussion notes: 
change MPF fit to "OK"

BLE 5/10/2012: Two (maybe four) of the right-ear craters could be removed?
MRK 5/14/2012: Tried removing (2 of them - the other two are legitimate) and does not get rid of "right ear". The class 2 crater is the primary reason for the "right ear". Will keep distribution as is.

Last Edited by MRK 6/3/2012