Aristoteles

D=88 km
Center: 50°N, 17°E

Count Area: 1247 km^2
Observed Density (@ 1km): 1600 ± 1200
Age: 2.7 ± 0.8 (+sec 3.6)
Stoffler epoch: Eratosthenian
Fit Density (@ 1km): 3400 ± 1100
PF fit: good, data slightly steeper, poor statistics, young

Computing Age Notes: 
~ good fit and adding secondaries considerable change in age (SM).
Large error bars does allow for a good fit, but is slightly steeper, and adding OSs slightly improves fit for small craters - no adjustment to this fit, but considered maximum slope for steep end (MRK).

USGS geology: 
All mapped as Eratosthenian crater material. There are two separate floor materials though.

Wilhelms: 
Eratosthenian

Floor material: 
Best guess is not original (at least area counted). Area flat, peak very small, sharp contacts with rim wall may indicate resurfacing. Crater sitting in mare, but this would be young mare. Younger crater Eudoxus to the south - possible resurfacing from that. Material appears hard? Hummocky area may be original?

Geology Observations: 
Ejecta blanket visible, but no rays and not bright in WAC. Central peak very small - partially buried? (Eudoxus has a small peak ring). Floor mostly flat, but hummocky area to south and east (ignored). Two chains with larger craters (up to ~ 1.2 km) and a few chains with smaller craters. 

SFD Observations: 
Dominated by class 3. Steeper distribution. No shallow "right ear". Slope(Diff)=-5.9 ± 1.1

Discussion notes: 
data is steeper than fit, but no change to fit recommended, possibly due to secondaries

Also examined by Baldwin (1985) and Neukum and Konig (1976)
Baldwin: density=7000 ± 200, age < 3.5 Ga, area=5319 km^2 (ejecta?)
Neukum: density=5100 (ejecta)

Last Edited by MRK 11/14/2012