Langmuir

D= 92 km
Center: 36°S, 231°E

Count Area: 650 km^2
Observed Density (@ 1km): 4600 ± 2700
Age: 3.5 ± 0.1
Stoffler epoch: Late Imbrian
Fit Density (@ 1km): 5900 ± 1000
PF fit: good, poor statistics, area < 1000 km2

Age calculation notes:
poor statistics (SM).
OK fit within error (agree with poor stats) - use as is; no OSs larger than resolution limit (MRK).

USGS geology: 
West crater rim mapped as Imbrian - Pre-Orientale, crater floor covered by Orientale discontinuous ejecta on east side and Imbrium age plains on west (counted area). Material counted likely Late Imbrian.

Wilhelms: 
N/A

Floor material: 
Best guess is not original. USGS indicates coverage by later Orientale ejecta and other Imbrium aged material. 

Geology Observations: 
Some ejecta blanket visible, but erosion is evident. Rim crest also shows signs of erosion. Larger central peak, has eroded appearance. Most of floor is smooth. Hummocky areas at 12 and 6 o'clock positions - likely resulting from collapses or ejecta from superposed craters (avoided). Large secondaries on west side of crater (side avoided). Much smaller, fresh secondaries on east side (below resolution limit cutoff - no all+sec age comparison needed). Likely age dichotomy between west and east sides.

SFD Observations: 
Dominated by classes 3 and 4. Distribution has steep slope. No shallow "right ear". Slope(Diff)=4.7 ± 1.0.

Discussion notes: 
no issues

Last Edited by MRK 12/13/2012