When the concretion was first broken open, there was a significant space around the hammer. This item was taken from a creationist publication, which has an obvious stake in undermining the prevailing scheme of geological dating. Nowhere does the report say the concretion was found firmly embedded in the Ordovician sandstone matrix. The concretion may have been loose on the surface. The whole business is at once fascinating and suspicious.
Anomalies is described here .
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