<div dir="ltr">For that matter - are such cracks more common on heavily curated tools that were used over many years?<div><br></div><div>Alice</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 28, 2015 at 10:48 AM, Haskel Greenfield <span dir="ltr"><<a href="mailto:Haskel.Greenfield@umanitoba.ca" target="_blank">Haskel.Greenfield@umanitoba.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Hi. These are very strange. At first I though they are a combination of age related since I don't see them on my experimental work with fresh bones. Something similar only appear on samples when I use dried or weathered bone. But the cracks usually go
beyond the cut mark in those cases. This photo shows them to be limited to the central grooves. It might be a result of the type of pressure applied to the tool, when used on dry, but not weathered bone. Hope this helps.</div>
<div>Best</div>
<div>Haskel</div>
<div><br>
Haskel Greenfield
<div>Sent from my iPad</div>
</div>
<div><br>
On Aug 26, 2015, at 11:01 AM, Griffitts, Janet L - (griffitt) <<a href="mailto:griffitt@email.arizona.edu" target="_blank">griffitt@email.arizona.edu</a>> wrote:<br>
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<p>Hello</p>
<p><br>
</p>
<p>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?<br>
</p>
<p><br>
</p>
<p>Janet<br>
</p>
<p><br>
</p>
<div>
<div><font size="2"><span style="font-size:10pt">
<div>+++++++++++++++++++++++++++++++++++++++++++++++++<br>
Jan Griffitts<br>
Visiting Scholar<br>
Dept. of Anthropology,<br>
Tucson,Arizona<br>
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+++++++++++++++++++++++++++++++++++++++++++++++++<br>
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<div dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Bonetools <<a href="mailto:bonetools-bounces@listserv.niif.hu" target="_blank">bonetools-bounces@listserv.niif.hu</a>> on behalf of
<a href="mailto:marinaevora@sapo.pt" target="_blank">marinaevora@sapo.pt</a> <<a href="mailto:marinaevora@sapo.pt" target="_blank">marinaevora@sapo.pt</a>><br>
<b>Sent:</b> Wednesday, August 26, 2015 7:51 AM<br>
<b>To:</b> Mailing list for archaeologists of the research group for the study of object and waste of bone, antler. ivory and horn.<br>
<b>Subject:</b> Re: [Bonetools] Wave-like cracks in striations</font>
<div> </div>
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<div>
<p>Hello,<br>
<br>
the bones I used were fresh ones.<br>
<br>
regards,<br>
Marina<br>
<br>
</p>
<p>Quoting Justin Bradfield <<a href="mailto:jbradfield8@gmail.com" target="_blank">jbradfield8@gmail.com</a>>:</p>
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<div>
<div>Dear Marina and David<br>
</div>
Many thanks for your helpful suggestions.<br>
</div>
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...<br>
</div>
Regards<br>
</div>
Justin<br>
<div>
<div>
<div>
<div>
<div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 23 August 2015 at 13:15, David Constantine <span dir="ltr">
<<a href="mailto:dkconstantine@btinternet.com" target="_blank">dkconstantine@btinternet.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div style="color:#000;background-color:#fff;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,Sans-Serif;font-size:13px">
<div><span>Hi Justin, </span><br>
</div>
<div><span>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. <br>
<br>
Regards,<br>
<br>
David Constantine</span></div>
<br>
<div><br>
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<div dir="ltr"><font face="Arial" size="2">On Sunday, 23 August 2015, 10:18, Justin Bradfield <<a href="mailto:jbradfield8@gmail.com" target="_blank">jbradfield8@gmail.com</a>> wrote:</font></div>
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</div>
</div>
<div>
<div>
<div>
<div>
<div dir="ltr">Dear WBRG
<div> </div>
<div>Can anyone help me identify the cause of these cracks that develop in striations/cuts on bone (see attachment)?</div>
<div> </div>
<div>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. </div>
<div> </div>
<div>Thanks in advance</div>
<div> </div>
<div>Justin</div>
<div> </div>
<div> </div>
</div>
</div>
</div>
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<p> </p>
<div><br>
Marina Évora<br>
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