File:Mare-imbrium jferreira 23sep2016 001.png

Western Mare Imbrium -- Promontory Laplace (just visible, upper left conrer) and Promontory Heraclides, a short distance below mark the entrance to Sinus Iridum (not visible to left). What I was after in this image of the 23 day old Moon was the series of wrinkle ridges arcuate to Imbrium that run from the mouth of Iridum, through crater C. Herschel, sweeping southeast down to crater Lambert, then continuing south towards crater Eratosthenes (just beyond the lower right corner of the image. The section of wrinkle ridge south of crater C. Herschel is designated Dorsum Heim, the paralleling ridge continuing south to crater Lambert is Dorsum Zirkel. From my reading, these ridges are tectonic in nature, resulting from the cooling and contracting of the Mare lavas that filled the Imbrium basin. Of particular interest is the 55km diameter 'phantom crater' Lambert R just visible immediately lower right of crater Lambert. This image also nicely shows some of the secondary cratering and complex of rays created by the Copernicus impact. Numerous small (read tiny) white ring craters can be seen over the entire region, the prominently rayed, though incredibly small (1.5 km) crater Louse can be seen at lower left between craters Delisle and Diophantus. The more learned may have much more to add as I'm sure there is some interesting details tied to the numerous isolated mountain peaks and ridges. Imaged with a C925 and ZWO ASI120MM. Jim Ferreira, Livermore CA