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Pleistocene sand from a Pleistocene shell

December 14, 2012

Just over three years ago I worked on an archaeological site at Meare in Somerset (sadly unrelated to the famous iron age lake villages). The ‘natural’ was a yellowish brown sand, known as the Burtle sands. These sands were laid down when sea level was much higher than it is today during the last interglacial (Marine Isotope Stage 5e – roughly 130-115 thousand years ago), the warm period before the most recent glaciation. While  I was working there I picked up a shell from this sand, a flat winkle (Littorina obtusata).

Littorina obtusata from Burtle sands, Meare

Littorina obtusata from Burtle sands, Meare

Looking at the shell recently, I noticed it contained quite a lot of the sand, which I thought it might be interesting to look at

The Burtle sand from inside the shell

The Burtle sand from inside the shell

Under the microscope I could see these fragments of an attractive pink and white shell, the pheasant shell (Tricolia pullus)

Fragments of Tricolia pullus

Fragments of Tricolia pullus

There was also a very wave-worn foraminiferid, which I think is Ammonia beccarii var. batavus. Forams (foraminifera) are single-celled protozoans that live in the sea. Many of them – like this species – have a calcareous shell called a test which is often well-preserved. Different species of foram have particular preferences for where they live in relation to the sea – some are part of the plankton, some live on the sea bed on the shelf, others are intertidal but live very close to the sea, while others live quite high up in saltmarshes. This species is intertidal, living quite low on the shore, however it has clearly been moved from wherever it died by the waves.

Foram from Burtle sands, Meare

Foram from Burtle sands, Meare

Another view of the foram

Another view of the foram

Another shell I wasn’t very sure about. It’s a juvenile, and quite broken. I think it might be Lacuna vincta, another intertidal species.

Broken shell

Broken shell

Another view of the broken shell

Another view of the broken shell

I think the fact that the winkle shell is quite well-preserved suggests that it has not travelled far by sea, perhaps suggesting that the sand were laid down at a time that the site was intertidal. Really, I would need to look at a much bigger sample to be sure. The sand is probably the same as the Middlezoy Member of the Burtle Formation (see Hunt 2006 for details).

Hunt, C.O., 2006. The Burtle formation, in Hunt, C.O., and Haslett, S.K., eds. Quaternary of Somerset: field guide. London: Quaternary Research Association. pp. 173-86.

Follow up to ‘Self-publishing advice wanted’

November 10, 2012

I just wanted to write a quick follow up to my last post, especially to promote part of Doug Rocks-Macqueen’s comment on it:

Ubiquity press has got some funding to do some Open Access digital books. you may want to hit them up to see if they would be interested in yours.

As luck would have it, Tom Pollard of Ubiquity Press was talking at the Digital Engagement in Archaeology conference at UCL yesterday (along with Victoria Yorke-Edwards who edits the Ubiquity-published Journal of Open Archaeology Data – which I think is a great idea, and I’m going to set about attempting to contribute asap), and he did mention that they were looking to move into ebooks. Ubiquity are doing great work with open journals – especially in archaeology, and are well worth investigating.

For those interested in self-publishing, the rest of Doug’s comment is useful as well.

And, rambling off-topic, but neatly closing a circle, Doug and I were both also presenting at the UCL conference - Doug some very thoughtful papers about finding the right platform for digital public archaeology and also about getting a presence online in minutes for free; my contribution – jointly with Colleen Morgan – was about what happens when your free (or paid) web host no longer offers hosting, using the closure of Geocities in 2009 as an example. The slides and videos (edited by Doug) will be online shortly, as well as Storify compilations of the conference’s Twitter back channel. The papers will be published next year, quite possibly via (who else?) Ubiquity Press.

Self-publishing advice wanted!

November 5, 2012

I’ve been working on a book, not a deeply academic volume at all, more a practical handbook for professionals and students. Slightly more specifically, it’s a visual identification guide. It has a long way to go, but I’m hoping to have it finished early in the new year. I am very keen for it to be open access when it does come out, possibly with a paid print on demand version if needed. My idea was to publish it via WikiArc – possibly as WikiArc Press or similar, and then if the process isn’t too arduous (or someone else is willing to help) to make the imprint available to others who might want to do something similar. Specifically I thought I would create a static version – available via pdf and Kindle/ other ebook formats, have an associated wiki area on WikiArc to allow user revisions, and to make print on demand of the static version available via Lulu or similar. Although it isn’t a major piece of scholarship, I would like it to be seen as a “serious” book, with ISBN etc., and I do intend to ask various people to scrutinise the work before it is released. Does this all this seem worthwhile?

A number of people I know have experimented with archaeological self-publication – Guy Hunt, for example, who used Blurb for his photographic collection The Dig, and Martin Locock, who originally made 10 Simple Steps to Better Archaeological Management available via Lulu (if I remember correctly, my apologies if I don’t). More recently (in fact, currently!) Alun Salt is working on self-publishing an ebook on Archaeoastronomy.

So what I’m looking for from this post is advice, or comments. Is it a quite a good idea or a horribly bad one? What is your experience of self-publishing? Will potential future employers (in other news, I’m a paid academic with an office and everything now) look at a self-published book on my CV with derision, and should I care if they do? If I did make an imprint for open access archaeological handbooks, would you be interested in contributing (hint: you wouldn’t make any money)? Let me know what you think.

Oxychilus cellarius in Carmel, California

August 11, 2012

I have just returned from a month in California, mostly spending time with family and friends, very much taking a break from PhD work. I couldn’t resist making some mental notes about the river mouth and brackish lagoon at the beach in Carmel, however, nor picking up the shell above when I saw it in the garden of the house we were staying in. It is an Oxychilus cellarius, interesting to me because it is a European species, familiar to me from my PhD and commercial work, and now well-established in various parts of the United States. It has previously been reported in landscaped areas of San Francisco, along with a number of other European species (Roth 1986). Invasive snails are an ecological problem in the United States, where  European and African taxa, including giant African land snails, have made themselves at home to the detriment of native fauna.

In contrast, few American snails have been introduced to the UK. While working on some wood recording at the offices of the Newport Ship project, I noticed a small population of the American freshwater snail Physella acuta living in the water tanks. These are now well established in Britain. Probably the most famous ecologically troublesome introduction from America is the grey squirrel Sciurus carolinensis, which has almost entirely displaced the native red squirrel Sciurus vulgaris. A number of American marine molluscs, such as the Atlantic oyster drill Urosalpnix cinerea and especially the slipper limpet Crepidula fornicata, were accidentally introduced to Britain in the late 19th Century along with the oyster Crassostrea virginica. This was deliberately introduced at a time when oysters were exceptionally popular and stocks of the native oyster Ostrea edulis were declining. The accidental introductions have caused further difficulties for native oysters.

Part of my PhD research is to look at when new species of snail or marine mollusc arrive in the Outer Hebrides. Building a database of well-dated archaeological contexts in which a known non-native arrival is present or absent allows that species to be used for relative dating of nearby sites, the same way pottery sherds or lithic technologies might be used to give a rough date for a context.

I previously blogged about introduced snails in Britain here and here

Reference

Roth, B., 1986. Notes on three European land mollusks introduced to California. Bulletin of the Southern California Academy of Sciences, 85 (1). pp. 22-28. Available online here

Tufa imprints of shells

May 19, 2012

Some time ago I posted some photos of clay imprints of the inside of shells. This week I came across the imprint of the outside of a shell (I think this is also Discus rotundatus – but I’m open to being told otherwise) preserved in tufa:

Snail imprint in tufa

Snail imprint in tufa

Tufa is especially fascinating for me. It is a calcareous precipitate, in this case formed when spring water which has passed through limestone emerges and evaporates. In prehistoric Britain it seems to have formed in swampy woodland under the more humid climatic conditions that were present in the Mesolithic. It would often form extensive deposits across the landscape, many of which were several metres thick. These would have been visually striking, as the tufa would coat everything it came into contact with white, effectively petrifying plants. At Cherhill in Wiltshire, John Evans found tufa imprints of plant leaves in his snail samples (Evans & Smith 1983). It does still form in Britain, but on nothing like the same scale as in prehistory.

Here is a juvenile shell of Pomatias elegans covered in tufa:

Pomatias elegans covered in tufa

Pomatias elegans covered in tufa

 

Reference:

Evans, J.G., and Smith, I.F., 1983. Excavations at Cherhill, north Wiltshire, 1967. Proceedings of the Prehistoric Society, 49, pp. 43-117.

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