Baillaud

D=89 km
Center: 75¡N, 37¡E

Count Area: 4670 km^2
Observed Density (@ 1km): 21400 ± 2200
Age: 3.9 ± 0.1 (+sec: 3.9)
Stoffler epoch: Nectarian
Fit Density (@ 1km): 21700 ± 2100
PF fit: good, large craters are slightly shallow

Age calculation notes:
good fit (SM).
good fit except largest crater ("right ear", but only one crater) - use as is; adding OSs produces slightly worse fit, but does not change age (MRK).

USGS geology: 
Crater rim material mapped as Imbrian to Pre-Nectarian. Floor material mapped as fill with Late Imbrian age.

Wilhelms: 
Rim is Pre-Nectarian. Floor is Imbrian fill - possibly Imbrium ejecta(?).

Floor material: 
Best guess is not original. Very smooth flat floor, material has sharp contact with wall, wall is shorter than expected, no central peak. Material looks relatively fresh. Hard?

Geology Observations: 
No ejecta blanket visible. Rim is severly eroded. No central peak. Floor very smooth and flat. Crater rim breach at south. Several secondary chains/clusters with various sized craters (up to ~ 1.8 km) of various degradation states.

SFD Observations: 
Smallest craters < ~ 900 m dominated only by class 3 and 4. As craters get larger they are dominated by less degraded classes. Has steep SFD for small craters (< ~ 4 km). Becomes shallow for larger craters. Shallow "right ear" (only one crater). Slope(Diff)= 4.3 ± 0.3.

Additional Note: 
Very similar to Arnold in geology.

Discussion notes: 
Fit changed to "good"? perhaps remove extended area to south

Notes from Brian's adjustment:
- Counting boundary:
	Looks good - maybe exclude tiny bits near 11:00 and 1:00?
	Removed extension to south beyond crater rim (MRK).

- Secondaries:
	Lots of secondaries, well marked.

- Removal of large, buried craters:
	None.

- Size adjustment of large craters:
	None.

- Explaining unusual cases:

- Future actions:
	None!

Last Edited by MRK 11/15/2012