List of Faunmap age codes
Evaluation of, and decisions about assignment of an Analysis Unit to an age
class are not always straightforward. The files served here use the "Research
Ages" (RESAGE) as defined on pp.24-25 of the Faunmap hardcopy.
If an Analysis Unit was predominantly incorporated in one RESAGE category but
overlapped slightly with another, it was necessary to decide whether it
should be assigned to the predominant category or whether it should be
lumped with both categories. For example, if an Analysis Unit had minimum
and maximum ages of 2100 years B.P. and 4300 years B.P, respectively, it
was predominantly in the Late Holocene but overlapped slightly with the
Middle Holocene. To resolve these issues, it was decided that if the
overlap was less than 500 years, then the Analysis Unit would be assigned to
the predominant category (e.g., Late Holocene, in this case). If the
overlap was greater than 500 years, then the Analysis Unit was referred to
a combined time category (E.G., Late/Middle Holocene). For the boundary
between the Post-Columbian and Late Holocene, an overlap of 50 years was used.
Some things to note:
- Each analysis unit is assigned to one and only one time unit.
- A locality may contain any number of analysis units, and any number of
time periods.
- In the files searched here, there is a single record per taxon, per age
category, per locality.
- The age categories are mutually exclusive: searching for LMHO will
not give you the records of LHOL and MHOL, but only
those records who could only be assigned to LMHO.
- For more detailed searching, you will have to download the database and
move it into your own database managment program.
- The search forms have the added ability to not reselect by
age category--this is labeled "All Time Periods." Searching with this will
give you all localities in the database with that taxon regardless of age.
- Finally, we have not included all of the age categories in the
"pull-down" items. If you want to search for (for example) HIHO, use
the query form for Lynx.
Here are the codes and values used for assignment.
HIST (Post-Columbian) 0-550 years B.P.
LHOL (Late Holocene) 450-4500 years B.P.
HIHO (Post-Columbian/Late Holocene) 0-4500 years B.P.
MHOL (Middle Holocene) 3500-8500 years B.P.
LMHO (Late Holocene/Middle Holocene) 0-8500 years B.P.
EHOL (Early Holocene) 7500-10,500 years B.P.
EMHO (Early Holocen/Middle Holocene) 3500-10,500 years B.P.
LATE (Late Glacial) 9500-15,500 years B.P.
EHLG (Early Holocene/Late Glacial) 7500-15,500 years B.P.
FULL (Full Glacial) 14,500-20,500 years B.P.
GLAC (Glacial) 9500-20,500 years B.P.
HOLO (Holocene) 0-10,000 years B.P.
WIHO (Holocene/Pleistocene) 0-110,000 years B.P.
LWSC (Late Wisconsin) 20,000-40,000 years B.P.
WISC (Wisconsin) 10,000-110,000 years B.P.
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