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the site during the 17th-century occup.tion.
Sampling
The 17th-century occupation deposit at Ren- was a
distinctive gray black mottled organic sand containing numerous
artifacts. It was largely confined to the interior of the house and
the area imdiately in front of the doorday. A pollen sample from
the surface of the cobble floor rnside the house (pal) and
cornparafive samples fronthe 1660-1680 occupation stratum above the
floor (po3), the roof collapse debris inslde the house above the
floor (pr21, and the Ilth-century occvpation dcposlts just outside
the doorway (prl) were selected for analysis (Table 1).
Labordtoey methods and Data Presentation.
pollen extraction follouedMehringer (19671. and residuesrerc
mounted in glycerol. The pollen was identified at llor with
problematical grains enmined under oil imecsion at LOOOX. Four
hundred pollen grains vere tabulated for each sample. Pollen
concentrations per gram of sample vere computed, following
Benninghoff's (1962) exotic pollen addition method, to permit
recognition of site formation processes (Figure 3 ).
pollen spectra calsularsd fmm two different sums are
presented in the poilsn diagram (Figure 3). The open line b an in
the diagram are percentages computed from separate sum tor
arboreal and non-arborsal pollen types. This separation helps to
differentiate regional (tree-dominated) and local (herb-dominated)
pollen types to some extent, and it reducer the stariatical
dlstort~ons that the contributions of pollen types reflecting
different phenomena induce in each other. It has the disadvantage
of producing possibly misleadingly high percentages in some
rnnranseo from small counts among the minor types. The solid
colored portion of the diagrams registers relative frequencies
based on the identifiable pollen of all types.
!
pollen concentration figures were not computed for individual
taxa, because these would not be meaningful in the absence of
chronolog~cal control over sedimentation rate and night be mistaken
for pollen influx data.
RIA pollen grains roo corroded to be identified were tabulated
to provide the pollen degradation element of the site fomtioa i
process record (~igure 1). unidentifiable pollen grains were
included in the concentratLon figures but were not incowrated in
any am from which the frequencies of other types vere computed.
=he terns "corrodedm#. "degraded," and "deteriorated" are usad
interchangeably, in the generic sense, to refer to cumulatitlve postdeporltion
damage of any kind other than tearing, rather than in
reference to specific kinds of damage as employed by Cushimg (19641
and Havinga (1967, l98l).
The most common English names applied to plants are employed
in the text and diagrams. The Latin name of each taxon is given in
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