Vestine

D= 98 km
Center: 34¡N, 94¡E

Count Area: 1979 km^2
Observed Density (@ 1km): 16200 ± 2900
Age: 3.8 ± 0.1 (+sec: 3.8)
Stoffler epoch: Early Imbrian
Fit Density (@ 1km): 17300 ± 1900
PF fit: good, smallest and largest craters slightly shallow

Age calculation notes:
~ good fit (SM).
good fit - large D within error - use as is; adding OSs doesn't change fit or age (MRK).

USGS geology: 
Crater mapped as Pre-Nectarian. Most of crater floor mapped as fill with a middle Imbrian age.

Wilhelms: 
? (couldn't find)

Floor material: 
Best guess is not original. Smooth flat floor, edges meeting wall look embayed, couple of filled larger craters, small peak. Also surrounded by a few craters filled with mare. Material looks softened. Soft?

Geology Observations: 
Ejecta blanket very eroded. Rim looks very eroded. Small central peak. Most of floor flat, but has a "texture" look, especially in south. Few small secondary chains/clusters with craters craters up to ~ 1.6 km.

SFD Observations: 
Small craters (< 1.2 km) dominated by classes 3 & 4, but large craters are dominated by fresher classes. SFD relatively flat on an R-plot. Slope(Diff)=3.5 ± 0.4. 

Discussion notes: no issues

Notes from Brian's adjustment:
- Counting boundary:
	Looks good.
	Some faint craters were missed, but not too many.

- Secondaries:
	Few present, looks OK

- Removal of large, buried craters:
	One large crater is a possible removal candidate, but is probably OK.
	I think the class 4 at 8:00 position should be removed. (MRK)

- Size adjustment of large craters:
	The large crater above is poorly marked and needs to grow.

- Explaining unusual cases:

- Future actions:

- Completed actions:
	Grew size of large type 4 crater (BLE).
	Marked some craters that were missed (BLE).
	Removed large mostly buried class 4 crater (MRK).
	Also changed a few "primaries" to "secondaries" (MRK).

Last Edited by MRK 12/18/2012