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| Scanning electron microscope (SEM) images of plant microfossils from the Lower Pecos Canyonlands. The top image is a mesquite pollen grain. It is about 60 microns long (1,000 microns = 1 mm). The lower images is an SEM photo of one of the pore areas on the surface of a prickly pear cactus pollen grain. The diameter of the pore is probably about 10 microns. TAMU Anthropology archives. |