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A natural rock fragment having the appearance of an artifact made by humans.

[From geo-, on the model of artifact.]


(Geological Science) geology a rock shaped by natural forces, as opposed to a man-made artefact
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2013, Fracture sand in Ohio: Ohio Department of Natural Resources, Division of Geological Survey GeoFacts 27, 2 P
GeoFacts -- Find geographic information for almost any place in the
It also increases the likelihood of classifying geofacts or gelifracted flints as artefacts, the so-called 'possibiliths' (Doronichev 2008).
As these and other studies demonstrate, if we know which practices, projects and tasks leave which artefacts, ecofacts and geofacts, and if we see what the patterning of these remains looks like in specific spatio-temporal contexts, then we should be able to make an argument for continuity and discontinuity of traditions across transitional periods, without the necessity for large-scale excavation.
Under the circumstances, we must ask whether these specimens are truly artefacts, as opposed to geofacts (sensu Haynes 1973) -- naturally flaked stone created when quartzite cobbles eroded out of the conglomerate and fell 100 m to be flaked and fractured on the shelter floor.
While there has been little or no discussion of the criteria used to sort purported artefacts from geofacts in the field, Parenti later developed an explicit set of criteria for identifying artefacts.
To what degree, for example, would specimens initially identified as geofacts (or artefacts) be acceptable (or unacceptable) by Parenti's criteria (a question made relevant by our examination of the backdirt specimens)?
On the basis of the calculations in TABLE 2, and taking as a starting-point the probability estimate offered by Pelegrin (that nature would produce such specimens less than 1% of the time), it is clear that under certain models one would expect large numbers of geofacts at Pedra Furada.
For example, were the probability of nature producing these geofacts 1% (.
It would also explain why no purported artefacts were seen by Parenti in the sample of 1000 in the two chutes within the site proper: at the estimated rate of production of 0-1 geofacts/yr (5000 in 50,000 years), on average only one geofact would be created each decade.
Statistics aside, it is possible geofacts could occur in smaller samples, but the odds are against it.
There are several possible objections to the alternative hypothesis that these specimens are geofacts.