Hi! Something a bit different from me this year – in previous years it’s been all about me, me, me: my posts on dental anthropology being a Real Thing and dead people in augmented reality were focused on my research. But for a change, I’ve corralled my wonderful colleagues here at the Natural History Museum London into a short video that gives a little look-see behind the scenes at all the things our resident researchers get up to in the name of archaeology…
It's that time again! Third year of my #dayofarch posts... if you're dying to see how they've changed over the years, have a look at 2011 (augmented reality!) and 2012 ( i reveal myself to be the tooth fairy)...
Really, I work at the Natural History Museum in London (and tweet at @brennawalks / blog at passiminpassing.co.uk ). And if you didn’t already know, I’m part of the collective Tumblr of awesome that is Trowelblazers ( @trowelblazers). We get all excited about inspirational female pioneers in the trowel-blazing arts 🙂
Archaeology, huh? Life outdoors? Fresh air?
Meh. Up to your hips in muddy water in February, more like it. That’s why I went and got myself a speciality….
Yes. I am a living, breathing example of the incredibly rare animal… the Dental Anthropologist. And yes, that’s a real thing.
Before I could even get to this stage, however, there was a long and laborious process of making histological thin sections, digitally scanning histological slides, and then digitising lots of information from the tooth. But the end result will be that I will know to the day the ins and outs of someone’s childhood – growth faltering, chemical composition changes, and a host of other things that we can find out in the lab.
So why teeth? A few reasons:
1. Teeth don’t remodel. You grow ’em once, and you’re stuck with them.
With the rest of your skeleton, remodelling can hide traces of past events — if you broke your arm as a child, you might not ever know from looking at your adult skeleton. Whereas everything that happens to your teeth as they are growing is crystalised right at the moment, leaving an unedited record of the time when your teeth were developing.
2. Teeth grow in a very regular pattern. Like tree rings.
Because teeth are so regular, we know exactly which bits are forming when. So if something happens to a kid, like a bad fever or a period of starvation, that disrupts normal development, we can work out exactly when it happened. Take a look at these lines, left on a tooth from when the individual was so sick that growth stopped for a time. If we magnify it in a scanning electron microscope, we can work out how old the kid was in days when growth stopped:
So, now you know. The Tooth Fairy is an archaeologist.
Archaeologists get everywhere. Like sand. This also applies to jobs, so it’s not totally impossible that someone who specialises in the minute structures of teeth (see my previous post from DayofArch 2011) would end up in the overwhelmingly awesome Human Origins Research Group at the Natural History Museum, London.
For starters, this is an awesome place to work. Yesterday I found out that during WWII, the collections were evacuated to stately homes across the country to escape the Blitz… complete with associated researchers. And there’s a basement here that’s really a bomb shelter which was used by Churchill as a telephone exchange – part of the secret tunnels which run all under this area up to the Palace and War Rooms. Herman Hess apparently even spent a few nights in the Anthro Stores before his trial.
And today, on the Day of Archaeology, this particular Tooth Fairy is gearing up for more research than you can shake a stick at. In relation to the main project I work on at the NHM I’ve:
I’m also getting ready to go out to the field to look at the teeth of children who died in central Anatolia (Turkey) sometime between 10,500-8,500 years ago. These are the remains of subadults from the amazing site of Aşıklı Höyük, the earliest settlement of the Anatolian Plateau.
I’ll be looking at the microscopic records of growth captured on every tooth–perikymata–to see how these children lived and grew. Like tree-rings, the lines on the outside of our teeth give a lot of information on how we grew (here‘s a more in-depth explanation). It’s a way to find out about health and development in early childhood at the very beginning of human settlement. Were there lots of growth disruptions? Can we see records of illness that might suggest seasonal diseases related to shifting subsistence patterns? That tell us about birth spacing?
I’m excited to find out. Even if I will totally get green dental impression material all over my nice new lab coat. It’s the price you pay for science!
N.B. All opinions etc. are my own, and do not necessarily reflect those of my benevolent employer. Images under creative commons fair use.
This week I have been at the Natural History Museum in London collecting data for my PhD project.
My project is looking at the size and shape change of the Aurochs across Europe over time. The Aurochs was the ancestor of domestic cattle, it appeared during the Middle Pleistocene and went extinct in Poland in 1627AD. In Britain they went extinct during the Bronze Age. This animal was quite commonly hunted by humans until domestication took place. The Aurochs was very similar to our modern day cattle, but larger. Some of the males were massive – often over 2 metres tall. Below you can see a couple of pictures of what they look like. You can imagine the amount of meat that you would get from one of these if you successfully hunted it, and you can see the size of the bones that I’m dealing with! My data collection consists of visiting Aurochs assemblages and taking measurements from the postcranial (limb bones) and teeth, as well as from the skulls.
The data collection part of my work has taken me to various places across Europe. So far I have visited Portugal, Denmark and Poland, and later this year I will also visit Italy and France. This summer I am concentrating on the British material. This will take me to a number of museums, including the Natural History Museum in London and the National Museum of Wales in Cardiff.
This blog post will talk about what I have been up to over the whole week, because then this gives you a sense of the different material I have been working on.
I had visited the NHM very briefly before so I knew pretty much what to expect, however you never know what you might find in hiding away there, so I was pretty excited about my visit. At the start of the week I was booked in to look at material held by the Mammal Group, then later on in the week I visited the Palaeontology Department too. The general rule is that the Palaeontology Department deals with anything up to the end of the Pleistocene, and then the Mammal Group keeps material from the Holocene (the Mesolithic onwards), with a few exceptions.
When you first arrive at the NHM you have to go through a number of security checks and they issue you with a security pass so that you can get ‘behind the scenes’ so to speak. I arrived at the Fleet theatre entrance on Exhibition road with a lot of stuff – I had all of my equipment, and other stuff to keep me going for the week. The security guard wanted to search all of my bags and was especially intrigued by the metal implements that I had with me. These included two pairs of callipers. One smaller pair for taking smaller measurements, and a larger pair curved callipers which I had brought in order to take measurements from massive skulls. In the end he seemed satisfied that I wasn’t going to try and kill anyone with them and let me go through.
Next I met up Roberto Portela from the mammal group who organised my security pass. Only then was I allowed loose on the bones. In the mammal group you aren’t allowed to take any bags or food down to the stores, you have to take everything you need down in a plastic box, so this always takes a little while to sort out. Then we went down to the basement. I was given a desk in the centre of the mammal collections surrounded by tall cupboards full of bones, and glass cases with articulated skeletons. There was no one else down there and it might have been a bit scary if it wasn’t for the fact that I was thoroughly distracted by the bones.
In the mammal group I was primarily interested in material from the site of Star Carr, a Mesolithic site in Yorkshire. A lot of aurochs were excavated from here, along with a large amount of Red Deer, and other wild animals. I was given access to the appropriate cupboards and then it was up to me to have a rummage through to see what I could find. Often it takes longer to find good bones to record than to actually record and measure them. Every museum (or even museum department) has a different system and many museums do not have an electronic database so you have to check things manually. This can be annoying, but also exciting because you could always randomly come across things that you weren’t expecting.
I managed to track down all of the material I needed and by the end of the day I had made a good start on it. On Tuesday I was able to get going a lot earlier because I didn’t have to deal with so much security and working was much faster once I had got into a rhythm.
The way that zooarchaeologists record bones can differ depending on their project. Some people try to identify every piece of bone if they can, but this can be very time consuming, especially if you have a very large number of bones. One way of getting round this is to decide on specific parts of bones that you will record. Because primarily I am interested in measurements, my protocol focuses on the parts of bones that will be able to provide me with that information. For example the distal end (the bottom end) of long bones, because these provide very useful information. I record all of my bones in an access database which, along with excel, I will later use to do my statistical analysis.
By the end of Tuesday I had finished recording most of the aurochs bones from Star Carr and a few other sites with less material. These included Thatcham, and East Ham. On Wednesday morning I only needed to come back to measure 3 skulls – these were in great condition, and absolutely massive. This may have something to do with the fact that they were much older than a lot of the bones I have been looking at – they were from the Pleistocene.
By Wednesday afternoon I was finished in the Mammal Group so I phoned Andy Currant in the Palaeontology Department and went over there to see what stuff they had. I spent the remainder of Wednesday afternoon and the whole of Thursday there.
The Palaeontology department had material from a site called Ilford in Essex. This material has been dated to the late middle Pleistocene so is much older than the Star Carr stuff, and much bigger! Surprisingly, considering it’s age, this material was also in much better condition than that from Star Carr, with many complete bones. Complete bones take longer than partial bones to record because there are more measurements to be taken so it actually took me a fair while to record all of the bones. There were a number of skulls found at Ilford, some with complete horncores. These were neatly packed into a cupboard but were extremely heavy and difficult to get out. We spent a long time figuring out what was the best way of moving them.
After I had recorded all of the bones from Ilford I had a hunt around to see if there was any other material that could be useful. The staff in the Palaeontology department were extremely helpful, and provided me with a list of potential sites, and cupboard numbers. Still, I had to hunt through quite a few cupboards and drawers before I eventually found another assemblage that would be useful. The material was from a site called Grays Thurrock. This stuff was less complete than that from Ilford, but there were an awful lot of teeth, which took a while to record.
Finally at 4pm on Thursday I finished with all of the material in the Palaeontology Department, and treated myself to some tea and cake in the museum cafe (I recommend the lemon drizzle – a real treat!).
So that brings us to the end of your whirlwind tour of my time at the Natural History Museum. If you have been inspired by zooarchaeology and want to find out more about the kinds of things that we do, then go here to the webpage of my research group: http://www.sheffield.ac.uk/archaeology/research/zooarchaeology/
I would like to thank the NHM Mammal Group, especially Roberto Portela, and the Palaeontology Department, especially Andy Currant and Spyridoula Pappa for their help with access to the collections and their general enthusiasm during my week at the Natural History Museum.