Xenoliths in the Sierra Nevada Batholith, Yosemite

These rocks are near the border of the Sierra Nevada batholith in Yosemite National Park. The dark green are clumps of moss, several inches across. The white rocks is the granite and the dark rock are pieces of what the granite intruded (xenoliths). The interesting aspect of this image is the geometry of the xenoliths. You should note and trace: 1) an angular xenolith with relatively straight sides that looks like its shape mainly reflects brittle deformation, 2) a more rounded xenolith, and 3) a xenolith with embayments (small bay like features defined by the xenolith-granite contact).

The major question that may be raised here is what can modify a xenolith's angular shape once it has been broken off the country rock and incorporated into the granite?

Link to interpreted version.

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