[Bonetools] Wave-like cracks in striations

[Griffitts, Janet L - (griffitt)]

Hello


For what it's worth, like Marina, I've also produced similar marks working fresh bone with stone tools and by using more or less fresh (a year or so old) bone or antler for pressure flaking.  Has anyone ever noticed whether we get differences in the formation of those cracks depending on the age of the bone/antler?  Could we use that to identify if bone minght have been fresh or curated when shaped for the last time?


Janet


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Jan Griffitts
Visiting Scholar
Dept. of Anthropology,
Tucson,Arizona

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________________________________
From: Bonetools <bonetools-bounces at listserv.niif.hu> on behalf of marinaevora at sapo.pt <marinaevora at sapo.pt>
Sent: Wednesday, August 26, 2015 7:51 AM
To: Mailing list for archaeologists of the research group for the study of object and waste of bone, antler. ivory and horn.
Subject: Re: [Bonetools] Wave-like cracks in striations


Hello,

the bones I used were fresh ones.

regards,
Marina


Quoting Justin Bradfield <jbradfield8 at gmail.com<mailto:jbradfield8 at gmail.com>>:

Dear Marina and David

Many thanks for your helpful suggestions.

Marina, were the bones that you worked experimentally old or fresh? Perhaps these wave-like marks are a combination of age and use with a lithic edge...

Regards

Justin

On 23 August 2015 at 13:15, David Constantine <dkconstantine at btinternet.com<mailto:dkconstantine at btinternet.com>> wrote:
Hi Justin,

I would say that they are cracks through age. They are starting from the cuts/striations as there will be many tiny weak spots along the length where small chips of bone have flaked away through manufacture or use. Similar to the way a porthole in a ship would start to crack at the corners if it they were angled rather than rounded.

Regards,

David Constantine



On Sunday, 23 August 2015, 10:18, Justin Bradfield <jbradfield8 at gmail.com<mailto:jbradfield8 at gmail.com>> wrote:


Dear WBRG

Can anyone help me identify the cause of these cracks that develop in striations/cuts on bone (see attachment)?

I've noticed this feature in several archaeological tools but never in my experimental replications. Could this be a natural property of aged bone or could a specific contact material be the cause? I've only ever noticed it in striations.

Thanks in advance

Justin


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Marina Évora

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