G. G. Schaber, and J.F. McCauley, 19800101, Geologic map of the Tolstoj Quadrangle of Mercury: , https://doi.org/10.5066/P9HAQSFZ.
Summary
The Tolstoj quadrangle in the equitorial region of Mercury contains the southern part of Caloris Planitia, which is the largest and best preserved basin seen by Mariner 10. This basin, about 1300 km in diameter, is surrounded by a discontinuous annulus of ejecta deposits of the Caloris Group (units cm, cn, co, cvl, and cvs) that are embayed and covered by broad expanses of smooth plains (unit ps). the southeast half of the quadrangle is dominated by ancient crater deposits (units c1, c2, and c3) by nondescript rolling to hummocky plains materials (units pi-ps). The ancient and degraded Tolstoj multiring basin, about 350km in diameter, is in the south-central part of the quadrangle. The large, well-preserved crater Mozart (285 km diameter) [...]
Summary
The Tolstoj quadrangle in the equitorial region of Mercury contains the southern part of Caloris Planitia, which is the largest and best preserved basin seen by Mariner 10. This basin, about 1300 km in diameter, is surrounded by a discontinuous annulus of ejecta deposits of the Caloris Group (units cm, cn, co, cvl, and cvs) that are embayed and covered by broad expanses of smooth plains (unit ps). the southeast half of the quadrangle is dominated by ancient crater deposits (units c1, c2, and c3) by nondescript rolling to hummocky plains materials (units pi-ps). The ancient and degraded Tolstoj multiring basin, about 350km in diameter, is in the south-central part of the quadrangle. The large, well-preserved crater Mozart (285 km diameter) is a prominent feature in the western part of the area; its extensive ejecta blanket and secondary crater field are superposed on the smooth low plains (unit ps) surrounding Caloris.
Digitized 1:5,000,000-scale geologic map of the the Tolstoj quadrangle of Mercury. Originally mapped on Mariner 10 imagery the map was digitized as a GIS product in 1999. The polygon shapefile has been smoothed and transformed to align with the more current 2013 Messenger basemap. Then a polyline feature was created and attributed with contact type.
