SPONGE BIT Shapes several millimeters across, like the one marked in red, might be cross sections of the oldest fossils of animal bodies yet found, from spongelike creatures preserved in Australian limestone. Maloof Lab/Situ StudioTWEENS Small fossils of what might be ancient marine sponges have turned up in the rocks between mounds of fossilized bacterial mats, or stromatolites, in the Trezona formation in south Australia.
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