Saturday, July 1, 2017

Moving Rock: The Lab Season




           

           1 July, 2017
            Mosselbaai, South Africa

            Ive spent serious chunk of time in the lab (thanks to a bout with malaria, but thats a story for another post), which I initially found disappointing, because I was missing several weeks of excavation. However, that has given me further opportunities to participate in more depth in this project than just the field portion of our work. This is partially responsible for  my recent decision to continue with the project as a graduate student (starting in August!).


            Lab has a bit of a reputation for being boring. I dont find this accurate, as lab is often where we make some of our most exciting discoveries. Excavators might not know what they are removing from an ashy hearth or black sediment, but as we clean, prep and analyze plotted finds, we knowledge of the site and its inhabitants grows exponentially.




           












             When we are not working on the materials, they are stored at a facility in Mosselbaai. The cavernous, frigid room is full of metal shelves reaching nearly double my height (I realize this isnt extremely high), and bolted together with lengths of steel, and stuffed full of boxes. The shelves make excellent but dubious ladders, for anything above the height of the ladder; or in case the ladder is buried under mounds of sediment. The Knysna project has numerous boxes of archaeological material, equipment, and other crucial items, all of which are grouped in several different locations in the building.


            A trip to storage is usually a great chance to meet all of the spiders you didnt actually want to know existed. I exhibit caution when lifting boxes, which can slow down our operation when trying to move them all. Our first trip, we gathered about 15 boxes of material, in addition to the 10 or so already moved to the MAPCRM lab or the house. After some rearranging, moving, and searching tubs and box labels to locate various items, we loaded the van and took everything away.


            The MAPCRM lab is currently full of other specialists, so we are using the house we are renting, a three story locality with an amazing view, and extensive common area, complete with a massive wooden table, which is perfect for analysis. We rearranged the house slightly to accommodate three additional tables and insane numbers of boxes. Ive enjoyed having lab here (instead of going to lab), although it means longer hours, it also means I can grab breakfast anytime, and stop and cook something for lunch, instead of packing it. Additionally, its close to our favorite coffee shop, Blue Shed, which means we can walk down there during teatime.


Our next task was to cart all the boxes of rocks up the rather steep driveway leading to the back door. We accomplished this by forming a box chain, which worked so well we did it again for the stairs. The stairs are set in a shaft, with a window overlooking the courtyard. Made of slick wood planks, set slightly away from the wall, and bolted via several metal beams, they lack any sort of railing. Weve dubbed them the true sobriety test, and have caused me moments of terror. I tend to creep up them with, one shoulder against the wall, hoping no one will fall onto the stone tiles below. Whenever we need to carry numerous heavy items, we station one person on each flight, and minimize the amount of moving around that is necessary (a strategy which has worked so far).



A lab season is critical for keeping up with the excavation. In addition to cleaning materials, we complete initial identifications, separate them by type, and make sure everything is accounted for before sending them to our specialists. During the field season, we run a lab to clean, ID and enter the plotted finds into a database (more on that in coming weeks). However, during this lab season we were focused on the reducing volume of boxes.



In addition to plotted finds (artifacts and ecofacts removed from site and given number), we keep EVERYTHING we excavate. Sediment, rocks, ect, are placed in a bucket, weighed, bagged and brought back to the lab to be sieved through a set of screens of 10, 3 and 1.5 milimeter widths. The non-sediment contents are given separate tags (to record provenience, or location, because different layers are different ages), and bagged separately. The best way to reduce the number of boxes is to sort through this material and remove ROOFSPALL, or random rocks which have fallen from the cave wall/ceiling and is not anthropogenic (humans didnt bring it to the cave/modify it). These rocks are then weighed and tossed.




However, any material which is anthropogenic needs to be kept and analyzed. We have an amazing lab crew this year, who have not complained about sorting box after box of 10mm. Invariably, we make fascinating discoveries. Sara, our lithics specialist, has been teaching everyone how to identify the material used and the features of a lithic (see below). We also look for FMR (fire modified rock), a task made difficult by the reddish hue of the roofspall. We are naturally suspicious of FMR. We have also found ochre (colorful pigments used for decorative purpose), fauna, ostrich eggshell, shell (we dug through part of a shell midden, which generated boxes of mostly fragmented shell), and much more. This is a great way train everyone in the recognition of anthropogenic material, which ensures that more of it gets plotted and does not end up in the screens.


Photo Credit: google images


I have not gotten to do as much of this as I would like, instead being in charge of keeping track of everything as it comes through the lab. Naomi and I have been working on checking and sorting plotted finds from earlier seasons. I have also started learning how to submit permits, a process which I find engaging but am warned that I will grow to dislike. It does have a lot of redundant paperwork..


We are heading out to Knysna tomorrow, which means our focus will shift slightly, from 10mm sort to plotted finds.

Also, now we have to move these boxes again.



Read more about our lab season at Dr. Cs blog:http://naomicleghorn.weebly.com/blog/why-quality-lab-time-matters


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