. Bulletins of American paleontology. 114 Bulletin 361 A B â C D RIwi Sphagmtnt Carophyllateae Fraximis Etigeniti Cmyii Rhabdailt'iua Ericaceae \ Hamchti \ Vlmus Plans Rapenea cf. Thornsonopollis Nyssti i Myrlaceae i Ntiphnr ; Ficiii Polygona Moms Alnits Sapotaceae Vms 2 Hex Anacardium Osmunda ;-â â Composits Querciis -J Typha â ^ Gramineae Salix Cephalatuhns Polypodnim Taxodnwi Chenopods Tnporates Cyperaceae Sagillana Utricularui Umbelllferae cf. Ovoiditcs Nymplwcti Punts Rhtzophora Conocarpus Lagtinctiliina Aviceiifuu Bells. Distance Text-figure 3.âDendrogram illustrating associations of sur
. Bulletins of American paleontology. 114 Bulletin 361 A B â C D RIwi Sphagmtnt Carophyllateae Fraximis Etigeniti Cmyii Rhabdailt'iua Ericaceae \ Hamchti \ Vlmus Plans Rapenea cf. Thornsonopollis Nyssti i Myrlaceae i Ntiphnr ; Ficiii Polygona Moms Alnits Sapotaceae Vms 2 Hex Anacardium Osmunda ;-â â Composits Querciis -J Typha â ^ Gramineae Salix Cephalatuhns Polypodnim Taxodnwi Chenopods Tnporates Cyperaceae Sagillana Utricularui Umbelllferae cf. Ovoiditcs Nymplwcti Punts Rhtzophora Conocarpus Lagtinctiliina Aviceiifuu Bells. Distance Text-figure 3.âDendrogram illustrating associations of surface pollen and spore categories. Four cluster groupings are based on a Chi-squared distance of â nus. Cluster D contains Rhizophora, Conocarpus. La- guncularia. Avicennia, and Batis (Text-fig. 3). Cluster A contains taxa that are generally found in lower frequencies than those of other clusters (Table 1). Sub-cluster Al includes taxa that have very low pollen frequencies and commonly appear in <2% of the sample sites. In addition, there are no clear patterns of spatial distribution for these taxa. The taxa in sub- cluster A2 appear in slightly higher frequencies than those of sub-cluster Al, but are still generally rare with no clear spatial distribution. The taxa in sub-cluster A3 are more common than the taxa in the other two sub- clusters, appearing in 30-50% of the sites. In addition, these taxa tend to occur in the freshwater marsh (slough), freshwater marsh with hammocks, and brack- ish marsh vegetation communities (Text-fig. 2). Clus- ter B is comprised of only chenopods. Chenopods are correlated most strongly with sites in the freshwater marshâslough vegetation community (Text-fig. 2). However, they occur at all sites and tend to have an inverse relationship with abundances of Rhizophora. Riegel (1965) also noted this relationship. Cluster C consists of taxa that are generally more abundant than those of cluster A and are consistently found at ap- proxima
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