Boundries of the Late Pleistocene

[Saint Abyssal <saint_abyssal@yahoo.com>]

Have the range of dates regarded as "Late Pleistocene" ever changed? 
Specifically, my conundrum is that I'm consulting a ~50 year old source 
(http://deepblue.lib.umich.edu/bitstream/2027.42/48593/2/ID455.pdf) on some 
local fossils (the Fenton Lake bony fish) and in one place in the paper it 
refers to remains as "Late Pleistocene" (page 6) but in another area a chart 
implies that the fossils are at most a hair over five thousand years old (page 
32). That date falls into the mid Holocene, so I'm wondering if paleontologists 
have ever regarded such recent dates as Late Pleistocene.

~ Abyssal