slgwv's photos with the keyword: measles rock

Jack standing on a granite outcrop full of mafic inclusions, which are distributed in bands and pods thru the host rock. I've been known to use the title phrase when giving a geology talk that includes my dog! Sierra Nevada, California, USA

Well, no. ;) It's not even a conglomerate, altho it looks like one! It's mostly granite, with the large round things weathering out being pods of more iron-rich rock. "Mafic inclusions", in the jargon. Their composition is basaltic, and it's now thought these could reflect "liquid immiscibility"--like oil and water, the granite magma and the basaltic magma didn't mix, with the basaltic liquid forming large "drops." The boulder itself is a glacial erratic. Sierra Nevada, California, USA, near the Blue Lakes.