Changes in soil organic matter in forest floor soil horizons are examined using data from a long-term soil change investigation.  In 2005 – 2006 we relocated 42 sites originally established in 1932 throughout the Adirondack Park to determine changes in forest floor soil organic matter from 1932 to 2006.  We excavated quantitative soil pits at each site and used loss on ignition (LOI) to determine SOM content and compared these results to previously reported data.  Over the 7+ decades, average forest floor (O_e + O_a) soil organic matter (SOM) content of all sites decreased significantly (P = 0.01).  The overall changes in forest floor SOM were driven by a significant decrease in both the O_a (P = 0.05) horizon.  Utilizing forest classifications, significant decreases in forest floor SOM were observed in pine-dominated (P < 0.01) stands.  Forest floor SOM content was, on average, lower in northern hardwood sites during the interval, but not significantly.  The forest floor SOM changes were unlikey driven by changes in forest floor depth.  There were no overall significant changes in forest floor depth over the interval in total forest floor or in either the O_e or O_a horizons.  However, forest floor depths of pine stands decreased significantly (P = 0.02) but, since pine-dominated sites have shallow forest floors (< 5 cm on average) and are not regionally wide-spread, this difference is negligible.  It is interesting to note that, although not significant, the average forest floor depths of all forest types have decreased since 1932.