The Landscape Research Centre Atlas of the Archaeology of the Vale of Pickering (http://www.landscaperesearchcentre.org/atlas/LRC_Atlas.html) presents “…the interpretations of more than three decades of landscape observation and research using air-photography and geophysics to map the archeaology of parts of the Vale of Pickering” via a Google Earth plug-in. Datasets include results of geophysical investigations, and a slider feature to select dates of interest. The text noted that datasets would appear as a left-click option, although I was unable to get that feature to work.
I liked the use of the Google Earth plug-in, and especially the date slider feature (there seems to be a way to select a range of dates, although I found this to be sticky).
AIA Geospatial Interest Group 
A more complete synopsis is found at: http://thelrc.wordpress.com/2012/02/26/the-lrc-digital-atlas-of-the-archaeology-of-the-vale-of-pickering/