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- W2007726148 abstract "This report is based on nine specimens of fossil conifer stems and leaves from the Early Oligocene Jansen Creek Member of the Makah Formation. They were collected along the northern shore of the Olympic Peninsula of Washington. The fossils are preserved as siliceous permineralizations and were exposed in surface view along rock fractures. Details of leaf morphology and epidermal construction appear on fracture surfaces of certain specimens while the cellular construction of the leaves and twigs is visible in thin sections. Leaves are dorsiventrally flattened, attached to twigs that contain up to four growth increments of secondary xylem, up to 2.3 cm long, 3.5 mm wide, and have parallel margins with minute teeth. The leaves are about 0.5 mm thick and have a central vascular strand surrounded by transfusion tissue. A large resin canal occurs abaxial to the vascular strand, and generally two additional resin canals occur in the mesophyll near each leaf margin. Leaves are mostly hypostomatic, with sunken stomata in two longitudinal bands, one to each side of the midline of the leaf and each containing eight to 13 longitudinal rows of stomata. Several unusual anatomical features in the stems also occur in the peduncle and cone axis of seed cones described as Cunninghamiostrobus goedertii , which occurs at the same locality. Thus, the leafy twigs belong to the same species as produced the cones. The cones, leaves, and shoots of this Tertiary conifer are similar to those of modern Cunninghamia but differ from the living species in several respects." @default.
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- W2007726148 date "1990-07-01" @default.
- W2007726148 modified "2023-10-16" @default.
- W2007726148 title "STEMS AND LEAVES OF CUNNINGHAMIOSTROBUS GOEDERTII FROM THE OLIGOCENE OF WASHINGTON" @default.
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- W2007726148 doi "https://doi.org/10.1002/j.1537-2197.1990.tb15191.x" @default.
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