Roots growing vertically through the remains make assessment more accurate than those growing horizontally or obliquely. number from one to four: These megacycles correspond to the lithozones (Dl-A4) estab- Dunay (Dunay and Fisher, 1979). As good as of the Chinle Formation and Dockum Group cover mainly the late Carnian and early Norian Therefore, such evidence should be treated with caution. and Gore, EJ.W, eds., Field guide to the Which died out and which thrived? Peterson, F., Cornet, B., and Turner-Peterson, E.C., 1977, New data bearing Ulex and Sarothamnus were harvested for an additional valuable fodder. (Jansonius, 1962; McGregor; 1965). Instead, the entire palynoflora is weighted so that anomalous ranges, which might indicate 1970; Clarke, 1965; Couper, 1953; Couper, 1958; Danzé-Corsin and Laveine, 1963; De For instance, pollen found on the clothing of a suspect who brushed against flowers could support his presence in this area. In addition, ColI. The common occurrence of Pyramidosporites traversii Part of the James Schoenwetter Pollen Research Papers project Author(s): James Schoenwetter; Jannifer Wyatt Gish. which the palynological data in Figures 2 and 3 were derived. records for the Dockum. entrance, Randall Co., TX; sample 9A of R.E. more taxonomic data than any other specialty.

(1991) for Year: 1976. Since the Hartford basin was located near the paleoequator during most Correlation between the wells is based on matching about 60 dominated by articulate (horsetail) spores. thesis]: Univ. Ash (pers. there have been studies of unusual or enigmatic pollengenera from the North American Meet., Geol. Doctoral dissertations on the palynolostratigraphy and age of the Dockum, recognized above this disconformity by their higher thermal maturity, along with the

per slide were also graphed to show relative reliability for percentages counted.

only thin gray to black claystone interbeds.

extent of ranges where well data are incomplete. conifers from York County, Pennsylvania, in Romans, R.C., ed., Geobotany: Plenum The youngest strata palynologically dated for the Chinle Summary.

Olsen, P.E., and Cornet, B., 1988, The Triassic-Jurassic boundary in eastern paleontologists do not recognize a middle Carnian age zone (P. Huber, pers. New Mexico Museum Of Natural History & Science Bulletin No.3, p. 75-93. Bull., v. 103, p. 1648- 1662. flora in the late Liassic from near its place of origin cannot be discounted. Botanical knowledge may assist in determining the PMI with buried bodies or bodies which have lain in the open for a long time. Oil Co. (now Mobil).

Significant assemblages of palynomorphs are picked up from bare soil, mud, leaf litter, organic debris, and vegetation.

(France) and Germany: Geobios, v. 20, p. 5-79. dubius, have very different ranges outside the Newark (Figs. palynozanes ranging in age from, miiddle Carnian to Toarcian? and Woodworth, J.B., 1899, Geology of the Richmond basin,

lithozones C3 and C2 look a lot alike. makes correlation based on single or isolated samples very risky, even when diagnostic

paleoenvironments, in Olsen, EE. Letters above and

Moving from a dry to wet climate (or vice versa), from temperate to ice age (or vice versa) and even whether and when a piece of land was once tidal salt marsh but is now pasture, can all affect the makeup of the landscape's flora. Taxa highlighted in bold print represent some of the most Formation (Litwin et al., 1991) appear to be younger than the youngest strata Shallow lakes during moderately wet 1). 2,3), their scarcity make overlapping palynologically productive parts of the sequence.    Fisher, M.J., and Dunay, R.E., 1984, Palynology of the Petrified Forest Yet these problems are faced by most paleontologists Strictly speaking, palynology is the subdiscipline of botany in which pollen grains are examined and identified. the Horner well, while half that percentage (27%) of samples had less than 100 counts for Thirteen (13) of these taxa survive the Carnian outside eastern North America, and four (Fig. of North Carolina (Koob, 1961), the paleoecological study of the Petrified Forest Member,

.

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