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Stillingia casca
Stillingia casca L.J. Hickey Mem. Geol. Soc. Amer., 150: 135. 19 Jul 1977
- Name
- Stillingia casca
- Rank
- Species
- Generic Name
- [Genus] Stillingia
- Authors (Pub.)
- Hickey L. J.
- Publication
- Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota [1977/7]
- Journal
- Memoirs of the Geological Society of America
- Volume
- 150
- Page number
- 135
- Year
- 1977
- Fossil Status
- leaves
- Stratigraphy
- Thanetian
- Location
- White Butte, Stark County, North Dakota, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43010A, B
Data for Paratypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43011 [pl. 37: 2], USNM 42792
- Diagnosis
- Leaf ovate-lanceolate, l/w ratio 3.9 to 4.1; 19 to approximately 14 cm;
w 2.2 to 3.6 cm; apex attenuate; base narrowly acute; margin with closely spaced serrations; serrations 5 to 8 per secondary, convex-convex or convex-straight (types A-l, B-l); sinuses angular; many serrations show small glandular spots or setae at apex; petiole missing; leaf texture membranaceous, wrinkled. Venation pinnate; primary vein stout; secondaries eucamptodromous, in 15 to 20 pairs; angle of divergence mainly between 55° and 65°, ranging up to 80°; secondaries fine compared to the primaries and of somewhat irregular course, mostly uniformly curved, ascending along the margins; connecting with the superadjacent
secondary by a set of percurrent tertiaries; giving off a finer, outer set of tertiaries to the tips of the teeth; intersecondary veins frequently present, anastomosing with the loosely reticulate inner tertiaries. Outer tertiaries irregularly percurrent; exmedial origin acute or at right angles, admedial origin obtuse or a right angle; outer tertiaries roughly perpendicular
to the midrib; quaternary venation reticulate but nearly obsolete; higher order venation and areolation obsolete.
