Midden sample floatation process going swimmingly
By Adrian Fenech, Graduate Diploma in Archaeology Student
I have started the floatation procedure that I described in my earlier post and it is proceeding reasonably quickly. I am still thinking about the defloccation procedure but I am unsure if I will have enough time to accommodate it.
Despite the mess of sugar water I am making in the archaeology labs, the floatation is going well because it has managed to float quite a few materials that will be picked out in the sorting stage. So far, the dominant floated materials have been charcoal and vegetation, the former would have been difficult to locate in sorting. This is because of the many other dark-coloured materials in the samples. The photos below show the resulting fractions produced by the floatation work.
Light fraction: material which floated
Heavy fraction: material that sank
The photos show the contrast in materials that the floatation produced. The light fraction consists primarily of charcoal with some vegetation and a few shells. The heavy fraction is dominated by shell with a considerable amount of stones and some faunal material (from a glance). I’ve only just begun the slow process of sorting through the heavy fractions; hopefully I’ll find some non-molluscan fauna!
I am considering the defloccation procedure because the sugar water is often black after its second floatation. After the materials have been rinsed off, they are still encrusted with a considerable amount of sediment. A test will have to be performed; two samples of materials, one with defloccation performed and one without will be sorted and the ease of sorting will be compared. This will be subjective, though because it will be difficult to get two samples that are equal in quantities of material types.
By Adrian Fenech, Graduate Diploma in Archaeology Student
The directed study I am working on involves reanalysing material excavated by Mick Morrison from Weipa in northern Queensland and uses sugar to aid the ‘floatation’ lab technique. I’m doing this because previous research projects on shell mound sites in northern Australia suggests that they contain very few faunal materials other than shellfish remains. The aim of this work is to find if the low recovery rate of faunal materials in samples is due to taphonomic or sampling technique biases. I am going to use chemical floatation to assist the sorting and faunal identification processes.
The chemical floatation process involves dry sieving the archaeological material and then immersing it in water that has been treated with some kind of chemical (Ross and Duffy 2000, p 33). This is designed to change the specific gravity of the water to separate materials that have different weights. For reasons of personal safety and economy, sugar will be used, hopefully the lab technicians, John and Chantal will not think that I am cooking in the lab.
A secondary process I am considering is defloccation which involves swirling archaeological materials around in a solution of water and some form of cleaning agent. I will be playing this by ear until I can see if the floatation cleans the material in any way.
Ross, A. and R. Duffy 2000, Fine mesh screening of midden material and the recovery of fish bone: the development of floatation and deflocculation techniques for an efficient and effective procedure. Geoarchaeology 15(1): pp. 21-41.
Vale, D. and R.H. Gargett 2002 Size matters: 3mm sieves do not increase richness in a fishbone assemblage from Arrawarr 1, an Aboriginal Australian shell midden on the mid-north coast of New South Wales, Australia. Journal of Archeological Science. vol. 29: pp. 57-63.
Claire’s ‘Mission on a Mission’
By Masters in Archaeology Student Claire Keating
Between the 24th June and the 20th July myself and fellow Masters of Archaeology student Amy Della-Sale accompanied Dr. Mick Morrison to the mining township of Weipa on western Cape York Peninsula to assist in the collection of archaeological data as part of a research project investigating the post-contact history of Aboriginal communities on western and central Cape York Peninsula. Our work this trip was at a place known to Anhatangaith Traditional Owners as Waypandan.
My thesis is part of this research program and sets out to understand the activities of the Moravian and Presbyterian missionaries who established two missions in the Weipa area between 1898 and 1963. It is the first of these missions at Waypandan which is the focus of my research. Having operated between 1898 and 1932 this place is of very high importance to the community and as such constitutes a poignant research question especially in terms of the activities of its European and Indigenous inhabitants. My aim is to re-evaluate survey data collected in 2008 in light of photographic and historical resources in order to understand with greater certainty the spatial layout of the mission compound itself.
Tidying up field plans at Waypandan
Data collection for my portion of this project consisted of my wandering solo around the mission laden with photo books, compass, measuring tapes, marker flags, a GPS unit and a drawing board becoming familiar with every fence post, building post, earth mound, artefact scatter, and stone line within a (roughly) hundred square metre area. However despite my solitude and feeling somewhat like a pack-horse I relished in the fascinating puzzle I saw unfolding before my eyes. What at first seemed to be a rather straight-forward research objective soon became not so. Programs of building relocation and rebuilding both during the mission’s lifetime and beyond have created an archaeological record which at once crosses several temporal periods.
Improvising in the field
In all, three weeks were spent mapping and evaluating the mission landscape of Waypanden which proved to be an extremely complex and at times challenging study area. Up on the mission there was much head scratching going on as I struggled to make sense of a fragmentary archaeological record and a photographic collection which began to pose more questions than answers; meanwhile down in the Aboriginal village Morrison was doing a fair bit of chin scratching as he and Della-Sale stumbled across more and more features that needed to be recorded.
In all seriousness though, at the close of this field season I came away with so much more than the archaeological data needed to complete my thesis. The experience of working and, for a time, living with the Indigenous community of Weipa was so enriching and warming that when I returned to the cold (literally) reality of Adelaide, I felt rather home-sick for the smells of the campfire, the sounds of the bush, the chattering children, and the stories of the old people. Though my time spent with the community was rather brief it has made me more determined than ever in my goal to one day work closely with Indigenous communities to help preserve their cultural heritage for benefit of future generations.