Where: Madison Co. County, Montana (45.2° N, 112.2° W: paleocoordinates 46.2° N, 107.4° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Renova Formation, Late/Upper Oligocene to Late/Upper Oligocene (28.4 - 16.0 Ma)
• bed-level stratigraphic resolution
Environment/lithology: unlithified, gray sandstone
Size class: macrofossils
Preservation: original carbon
Collection methods: quarrying, surface (in situ),
Primary reference: H. F. Becker. 1972. The Metzel Ranch Flora of the Upper Ruby River Basin, Southwestern Montana. Palaeontographica Abteilung B 141:1-61 [H. Sims/H. Lindon/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 23330: authorized by Hallie Sims, entered by Heather Lindon on 12.07.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
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| Ginkgoopsida | |
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Spermatophyta indet. A nearly orbicular structure, about 1 cm in diameter with darkened center and a light, wing-like margin consisting of a polygon mesh. In the counterpart this mesh also overlies teh central part. In another specimen the covering polygon mesh is present in the middle, giving the appearance of two darkened areas. This specimen particularly confirms the existance of the outer mesh over the entire structure.
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| Angiospermae | |
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Sapindus coloradensis, Koelreuteria bipinnatoides, Dipteronia insignis, Acer glabroides, "Crataegus elwyni" = Acer elwyni, Acer minor
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Populus adamantea, Populus cinnamomoides, Populus lindgreni, Populus balsamoides, Salix hesperia, Salix knowltoni, Salix taxifolioides, Salix wimmeriana, Salix truckeana
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Cercis sp. Linnaeus 1753 redbud | |
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Ulmus sp. Linnaeus 1753 elm | |
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Spiraea sp. Linnaeus 1753 meadowsweet | |
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Quercus sp. Linnaeus 1753 oak | |
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| unclassified | |
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Tracheophyta indet. There are possibly two species involved of leaves with a drip-point which may have been fairly large. This apex is cuspidate dentate and generally reminiscent of Zizyphus meigsii (Lesquereux) Berry. Leaves of the second set of counterparts have a more acuminate apex with a somewhat more rounded and possibly glandular dentation. Incompleteness precludes positive identification.
Tracheophyta indet. The assymmetry of this structure suggests a leaflet, somewhat similar to sapindaceous forms. Lateral veins are not discernible in the coriaceous lamina.
Tracheophyta indet. This specimen with counterpart appears to be a branch with attached leavs rather than a compund leaf, although at least one foliar structure is asymmetrical. The small, up to 1.5 cm long (est.) leaves are entire, ovate to lanceolate with a very strong midrib and fine secondary veins which bend upward at the margin. Some veins appear craspendodromous. A detailed morphological description is not possible because of its fragmentary preservation.
Tracheophyta indet. These ovate or elongate bud scales are coriaceious and rare in teh flora while they are numerous and variable in the York Rance assemblage, now in preperation.
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| Palaeohypnum | |
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