Bridgman

D=82 km
Center: 43¡N, 137¡E

Count Area: 841 km^2
Observed Density (@ 1km): 27300 ± 5800
Age: 3.9 ± 0.1 (+sec: 3.9)
Stoffler epoch: Nectarian
Fit Density (@ 1 km): 23900 ± 2400
PF fit: good?, largest slightly steeper, small area < 1000 km2 and many secondaries

Age calculation notes:
good fit (SM).
Generally a good fit - perhaps last point a bit off - use as is; adding OSs does not change fit or age (MRK).

USGS geology: 
Crater rim mapped as Nectarian. Crater floor mapped as fill with a middle Imbrian age.

Wilhelms: 
Nectarian (all materials)

Floor material: 
Best guess is not original (at least for area counted). Smooth flat floor, edges meeting wall are sharp and look embayed, small central peak. Material looks degraded. Soft?

Geology Observations: 
Ejecta blanket eroded. Rim looks eroded. Small central peak. East side of floor flat, west side more hummocky. Could be wall collapse. Several degraded secondary chains/clusters with small craters. Also one with larger craters (up to ~ 1.7 km).

SFD Observations: 
Craters dominated by class 4. Distribution < 1.2 km steep. Shallow "right ear" (more than 1 crater, but only one point). Slope(Diff)=4.6 ± 0.7.

Discussion notes: 
Change floor to "possible" original. give classes to secondaries. 

Notes from Brian's adjustment:
- Counting boundary:
	Looks good.

- Secondaries:
	Many small crater clusters marked, looks OK?

- Removal of large, buried craters:
	None present.

- Size adjustment of large craters:
	None present.

- Explaining unusual cases:

- Future actions:
	None?
	Nope, don't think so. Looks good. (MRK)

Last Edited by MRK 11/18/2012