Back
Corylus acutertiaria
Corylus acutertiaria L.J. Hickey Mem. Geol. Soc. Amer., 150: 121. 19 Jul 1977
- Name
- Corylus acutertiaria
- Rank
- Species
- Generic Name
- [Genus] Corylus
- 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
- 121
- Year
- 1977
- Fossil Status
- leaves
- Stratigraphy
- Thanetian
- Location
- Beckert Ranch, Dunn County, North Dakota, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43214
Data for Paratypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43213 [pl. 17: 1; 18: 2], 43215 [pl. 17: 4]; Princeton University: 20078 [pl. 18: 1]
- Diagnosis
- Leaf symmetrical, elliptic-suborbiculate to wide ovate; l/w ratio 1.1 to 1.8;
3 to more than 17 cm long; 2.2 to 15 cm wide; apex acute to obtuse; base rounded to mildly cordate; margin doubly or triply cut into obtuse, apiculate dentations or serrations; the largest of these are shallow, blunt lobes found at the ends of the secondary veins on some leaves; petiole 1 to 2 cm long; leaf texture thickly chartaceous. Venation pinnate, simple craspedodromous;
primary vein moderately thick and straight; secondary veins in 8 to 9 opposite to subopposite pairs, diverging at 40° to 45" (except for the lowest one or two pairs of weak secondaries that diverge at angles of 80° to 110°); secondaries relatively thick, only slightly curved toward the margin, lower secondaries provided with outer branches, from 5 to 6 teeth per middle secondary vein. Tertiary veins originate from the secondaries and midvein
mostly at high acute angles, although right- and obtuse-angle departures are occasionally found, these being slightly more common on the midvein; a short nonparallel, intersecondary vein is generally present between secondaries; tertiaries of moderate thickness, clearly differentiated from higher and lower vein orders, course percurrent, arrangement random
to alternate. Quaternary veins thin but strongly impressed; highest venation order, sixth; highest order with excurrent branching, third; higher order venation runs to the sinuses or tips of the smaller teeth; areolation strongly impressed, equant and polygonal, unranked, of medium size (0.6 to 0.9 mm) and with branched, freely ending veinlets. The impressions of two male(?) aments are provisionally included within this species. The larger of these is 4 by 0.5 cm and made up of spirally arranged, mucronate bracts, averaging 4 mm wide by 3 mm long.
