[Bonetools] doubts about raw material: Chalcolithic funerary structure

[Miriam Luciañez Triviño]

Dear Bonetoolers, 

I am studying a very interesting ensemble from a Chalcolithic funerary
structure from the southwest Spain. The typology of the objects is
varied (small figurines of zoomorphs, perforated disks, pins, rings...).
We also have lots of fragments of proboscidean ivory (fragments of the
unworked tusk). Lots of the objects are made of ivory, others of bone,
but we have some doubts about the raw material of some of the artefacts.
I would like to ask you for your help to identify the raw material, or
if you could give me any clue. I would like to show you as well some
structural features I've never seen before, if someone could explain me
the origin of them :) 

Some of the perforated disks are made of proboscidean ivory, but in
those that are entire I cannot be sure of the raw material because they
have a strongly worked surface. I would like to show you the features I
have found in one of them (files attached) and here the questions: Why
we see in this naturally separated tangential profile this kind of
"waves" and an undulating surface? In this natural separation I expected
to find adjacent "lines" (like in Virág, 2012: 1413, fig.6, and as I
have documented in other ivory objects). Have you parallels of this
perforated disks in Chalcolithic contexts (or Neolithic or Bronze Age)? 

In the images called unknown 1 and 1.1, will you say this is ivory? (Is
another object, maybe a small handle, with a perforation with
"something" inside) 

And the last question. In the photos schreger-cementum, do you think the
layer without Schreger and more "grainy" texture could be the cementum? 

Thank you so much for your help and suggestions, and sorry for so many
questions.... 

Bests, 

Miriam LT 

PD. Virag, A. (2012) Histogenesis of the Unique Morphology of
Proboscidean Ivory. _Journal of morphology _273: 1406-1423.

-- 

Miriam Luciañez Triviño
Contrato Predoctoral del Gobierno Vasco

Departamento de Prehistoria y Arqueología
Universidad de Sevilla
María de Padilla s/n. 41004. Sevilla. Spain
Phone: (34) 954 556906
Fax: (34) 954 559920

E-mail: mlucianez at us.es
http://www.departamento.us.es/dpreyarq/web
http://www.grupo.us.es/atlas
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