Bose

D= 95 km
Center: 54¡S, 191¡E

Count Area: 2602 km^2
Observed Density (@ 1km): 19200 ± 2800
Age: 3.8 ± 0.1 (+ sec: 3.9)
Stoffler epoch: Early Imbrian
Fit Density (@ 1km): 18100 ± 1600
PF fit: good, large craters are slightly shallower

Age calculation notes:
bad fit for large D, good fit for small D. Maybe layering? (SM)
good fit for small D, poor fit for large D ("right ear" crater) - 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 Imbrian age.

Wilhelms: 
Nectarian (all materials)

Floor material: 
Best guess is not original. Very smooth flat floor, edges meeting wall are sharp and look embayed, see what look like flow fronts/wrinkle ridges. Small central peak. Also surrounded by other craters filled with mare. Material looks fresh. Hard?

Geology Observations: 
Ejecta blanket very eroded and embayed by mare. Rim looks eroded. Small central peak. Floor flat. Several secondary chains/clusters with craters up to ~ 1.5 km and variety of degradation.

SFD Observations: 
Small craters (< 2 km) dominated by classes 3 & 4. Large craters dominated by fresher classes. Distribution < 2 km steep. Shallow "right ear" (more than 1 crater!). Slope(Diff)=4.0 ± 0.2.

Discussion notes: 
Might be real "v", lots of craters in context image of similar size. large class-4 crater likely buried. "v" not likely real - only a few craters.

Notes from Brian's adjustment:
- Counting boundary:
	Looks good, except the large central peak is included. 
	Not worried about peak in this case - MRK

- Secondaries:
	One secondary chain was missed near 8:00 (not marked as craters.
	A cluster near the 9:30 position was partially flagged.
	A cluster near the 3:00 position was partially flagged.

- Removal of large, buried craters:
	Looks OK, except one largish type 4 should be added.
	Removed a class 4 crater (MRK).

- Size adjustment of large craters:
	Three of the four largest craters are marked slightly too small.

- Explaining unusual cases:
	Bose was flagged in red (unusual case?)... not sure why (ble).
	Match column says "wide-v".

- Future actions:

- Completed actions:
	Many type 3/4 craters were missed, especially near the boundary. (BLE)
	This image should be remarked? (BLE)
	I would recommend a quick pass through to get those that are most
obvious. MRK (BLE - done)
	Grow size of three out of four larger craters. (BLE - no change)

Last Edited by MRK 11/18/2012