Notes on the Map of DNA samples in East Anglia, both compiled by Stephen Arbon.
At one time the region was smaller, with the boundaries defined by several more defendable geographical features:
• for ‘R1b’ haplogroup
• for ‘I’ haplogroup
These locations were then plotted on a scanned copy of an AA 1:250 000 map.
These were copied from ‘A New and Comprehensive Gazetteer of England and Wales of 1834’ by James Bell, as printed in ‘Phillimores ATLAS and INDEX of Parish Registers’. [Although there’s a large network of local roads, paths & villages that haven’t been included].
The positions of markers should be close but may not be exact because:
[yet to be completed]
- Several populated areas which lie along the periphery of East Anglia, eg Cambridge & Colchester.
- Other areas may have only ever supported thin populations such as:
- Some locations have no obvious reason for a lack of samples, eg Thetford, Claire, Haverhill etc. and may be just thru chance.
The number of dna markers so far submitted to the project only represent a tiny proportion of the population of East Anglia, ie a couple of hundred out of perhaps a half a million in the early 19th century. In addition, they are not a random sample. While this might not effect the accuracy of the overall results it certainly would if looking at any of the less populated areas.
So in our case, the 140 participants would seem to give a reasonably size for Norfolk & Suffolk taken as a whole and assuming they was no inherent bias from the way they were supplied that might skew the results].
There are a number of factors that mean that the project samples aren’t truly random:
- Internal Movement & Migration
While the movement of people before the Tuder period is largely unknown, in later times, rural workers often moved in May within their ‘hundred’ depending on work on offer. Additionally there was a large drift out of Suffolk & Norfolk in the 18th & 19th centuries to other regions such as Yorkshire & London and to other countries such as Australia, Canada, & New Zealand. As well as the earlier movements of the religious non-conformers to the American colonies in the 16th-18th centuries.
If for instance, farm workers were more likely to have been descended from the Angles for instance, and they were the ones who migrated, than the results may be skewed in a particular way.
Those with spare finance [eg America] would be more likely to have had dna tests.
- Possible Effects of having the same Co-ordinator
As David Weston has been significant part of both East Anglia dna & an U106 dna projects, there may be a higher representation from that clad.
Based on the dna results sampled so far, one might expect for every 10 samples for a parish there should be:
• Sites of coin finds of the Incenti & Trinovante tribes were scaled from maps from the ‘The Oxford Celtic Coin Index’ on www.finds.org.uk.
[A note from the website cautions that the maps display only a small proportion of coins found, ie only those with sufficient providence] and also the exact location may have been withheld to protect the site.
• Coin finds from Coritani & Cunobelin tribes were scaled up & then traced from maps in ‘WWW.Roman-Britain.org’, sourced apparently from ‘Barry Cunliffe's Iron Age Communities in Britain’.
- The small scale of the original maps, mean that the positions of coin-finds are only very approximate, probably to a few km. Additionally, coins from each tribe were traced from separate maps which may mean that those shown close together could actually be from a common hoard.
There is a web-site that showed significant areas of Roman coins in Britain, and I have traced the East Anglia section on to a separate copy of my map. But the very small scale of the original and the broad areas of Roman coin finds, mean that it is not all that useful. I’ve found a couple of books, but information that has been published on the geographical distribution of Roman coins in Britain seems minimal.
Observations on Coin Finds: