How about the borrow Daimonelix wich can be, without a doubt, attributed to Palaeocastor?

A Quote from

Martin and Bannett 1977, THE BURROWS OF THE MIOCENE BEAVER PALAEOCASTOR, WESTERN NEBRASKA, U.S.A.. Palaeogeography, Palaeoclimatology, Palacoecology, 22: 173--193

"Our data suggest that daimonelices were arranged in "towns" similar to

those formed by the modern Cynomys, although the existence of a similarly

complex social structure cannot be demonstrated. Daimonelices may be

absent over a wide area but enormously abundant in other areas in the same

upland facies and at the same stratigraphic level"

I know there are some who claim that Palaeocastor lived in smaller families like modern beavers, but the close proximity of the borrows is still a fact that should not be ignored.

Here is more recent work by Martin (1994): http://www.naturalhistorymag.com/htmlsite/master.html?http://www.naturalhistorymag.com/htmlsite/editors_pick/1994_04_pick.html

And probably this website can help you along a bit:

http://hoopermuseum.earthsci.carleton.ca/Burrowsite/home.htm

Edit:

The author Larry D Martin can also be found on Researchgate:

https://www.researchgate.net/researcher/16343394_Larry_D_Martin

Try searching on Neotoma:

http://apps.neotomadb.org/explorer

You should be able to find Pleistocene stuff in North America at least.  Searching for the taxon Cynomys gives me a bunch of sites, you can check which publications you're assocaited with from the explorer.

Thank you both so much for your help, this has really given me a good direction to go in.

Perhaps not what you're after, but some background refs to Bathyergidae, which may be useful.

Avery, G., D. Halkett, et al. (2008). "The Ysterfontein 1 Middle Stone Age Rockshelter and the Evolution of Coastal Foraging." South African Archaeological Society Goodwin Series 10: 66-89.

Cruz-Uribe, K., R. G. Klein, et al. (2003). "Excavation of buried Late Acheulean (Mid-Quaternary) land surfaces at Duinefontein 2, Western Cape Province, South Africa." Journal of Archaeological Science 30: 559-575.

Roberts, D., M. Bateman, D, et al. (2009). "West coast dune plumes: climate driven contrasts in dunefield morphogenesis along the western and southern South African coasts." Palaeogeography, Palaeoclimatology, Palaeoecology 271: 24-38.