[Bonetools] Wave-like cracks in striations

[Alice Choyke]

For that matter - are such cracks more common on heavily curated tools that
were used over many years?

Alice

On Fri, Aug 28, 2015 at 10:48 AM, Haskel Greenfield <
Haskel.Greenfield at umanitoba.ca> wrote:

> 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.
> Best
> Haskel
>
> Haskel Greenfield
> Sent from my iPad
>
> On Aug 26, 2015, at 11:01 AM, Griffitts, Janet L - (griffitt) <
> griffitt at email.arizona.edu> wrote:
>
> 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
>
>
> +++++++++++++++++++++++++++++++++++++++++++++++++
> Jan Griffitts
> Visiting Scholar
> Dept. of Anthropology,
> Tucson,Arizona
>
> +++++++++++++++++++++++++++++++++++++++++++++++++
> ------------------------------
> *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>:
>
> 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> 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>
>> 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
>
> *P* *Please consider the impact on the environment before printing this *
> *message.*
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