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 Sam Hedditch, Graduate Student
This is the second of my blog posts for the Cultural Heritage Practicum (read my first post here). In the past few weeks I have completed a variety of recording and labelling tasks with a number of different collections. While some of the materials are from recently excavated and less well known sites, others are from quite old and well known areas and their location at the museum stores is the best place for their storage and for further research.
Of particular interest so far has been the re-sorting of various excavations completed at Koonalda Cave in SA. It is hoped that working through the notebooks of the staff on the digs and the excavated materials that are currently at the museum may produce traces of organic material suitable for radiocarbon dating. This should extend the age of habitation of the cave well past the 20,000 BP that is currently accepted.
Shell artefacts from the Lake George collection. Part of a huge midden with many layers!
My most recent project has been re-bagging and labelling a collection of shells from an apparently enormous midden at Lake George, near Beachport in South East South Australia. A number of different shells occur in many of the units of the excavation and there was also a piece of very interesting glass near the surface of one site.
Some of the articles being rebagged from the Lake George collection.
Needless to say, there is a great potential for research by archaeologists interested at the museum. Going back over the old material donated and collected with a fresh approach or new techniques could be instrumental in revealing new information about the area or the people who lived there.
Until next time, I will continue patiently bagging and labelling! I am having a great time there is a wealth of information and relics on record here, sure to inspire the minds of many archaeologists (including me!).
By Sam Hedditch, Graduate Diploma in Archaeology Student
This is the first of my four blog posts in regards to the Cultural Heritage Practicum topic at Flinders. I will briefly describe what type of work I will be completing while under the employ of the Museum.
My predominant focus in the practicum will be lithics, or stone artefacts, which are a great interest of mine. I am working for Dr Keryn Walshe, Head Archaeologist and Researcher for the South Australian Museum. Keryn has done some amazing work in documentation and in archaeology in general. Her book, Roonka: Fugitive Traces and Climatic Mischief, is evidence of her skills and knowledge in Aboriginal cultural material. I consider myself to be very privileged to be working for her in this program and I am sure to learn a great deal.
I am principally working at the Hindmarsh store of the SA Museum. This was recently taken up by the museum having previously been used as an old state library storage space. There are an astounding number of artefacts and papers regarding archaeological work and material that are stored here. Many of the items currently at the store are donations from benefactors and are yet to be accessioned. Going through this material will form a large part of my practicum at the museum.
Canoe at entrance to State Library Building.
Correctly recording and cataloguing items is a very important job at museums and is the only way to account for the whereabouts of so many types of artefacts.
In some collections I will give a rough description of the type of artefact, the raw material of the artefact and any noteworthy features. The goal is to store the items appropriately so that they are more readily available for analysis in the future. Many challenges occur in this process as the paper, tape or marker used to note the artefacts may have worn out since its original collection by the benefactor and their interpretations of the type of artefact may differ entirely from current conventions.
Shelves at Hindmarsh store. My workspaces is on the left.
I have met a number of other researchers and volunteers at the store, and have been lucky enough to work closely with some on certain collections. They have a great deal of knowledge about their respective topics and working with such people will benefit my overall educational experience throughout my placement. I have already seen some rare and stunning examples of pre- and post-contact artefacts and can’t wait to see more.
Until next time, it’s back to the shelves for me!
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.
By Michael Diplock, Associate Lecturer in Archaeology
On the 11 & 12 June this year a small group of students & staff from the Archaeology Department at Flinders were treated to a special weekend alongside the majestic (& very healthy looking) Murray River at Maranggung near Tailem Bend. We had been invited to share some of our survey and geophysics skills in a joint project involving members of Karpinyeri Inc, Assoc. from Tailem Bend SA.