PBDB Collection

Almont: Clarkforkian, North Dakota

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

unclassified

	Meliosoma rostellata seed/fruit
	fruits (occasional)

	Angiospermeae informal Schizocarpic samara seed/fruit
	fruits (very common)

	Angiospermeae informal nonschizocarpic samara seed/fruit
	fruits (occasional)

	Angiospermeae informal Elliptical biwinged fruit seed/fruit
	very rare

	Angiospermeae informal Fruit with 3 laterally attached wings seed/fruit
	very common

	Angiospermeae informal Pedicellate capsule with papillate seeds seed/fruit
	rare

	Angiospermeae informal head of tricarpellate fruits seed/fruit
	heads (occasional), individual fruits (very common)

	Angiospermeae informal 6- to 7- loculed fibrous fruit seed/fruit
	very common

	Angiospermeae informal Fruit of 9 to 11 single-seeded locules seed/fruit
	very rare

	Angiospermeae informal Thick-walled unilocular fruit seed/fruit
	rare

	Angiospermeae informal Globose fruit with irregular surface pits seed/fruit
	rare

	Angoispermeae informal Six-lobed calyx seed/fruit
	very rare

	Angiospermeae informal Fruit with 5 to 6 concrescent follicles seed/fruit
	rare

	Angiospermeae informal Clavate structure seed/fruit
	rare

	Angiospermeae informal Fleshy fruit seed/fruit
	rare

	Angiospermeae informal Four-loculed winged fruit seed/fruit
	very rare

	Angiospermeae informal Globose pedicellate capsule seed/fruit
	rare

	Angiospermeae informal Asymmetric ellipsoidal seed seed/fruit
	very rare

	Angiospermeae informal Elongate infructescence seed/fruit
	rare

	Angiospermeae informal Staminate inflorescence with tricolpate pollen flower, microspore
	rare

	Angiospermeae informal Staminate inflorescence with monosulcate pollen fertile axis, microspore
	rare

	Angiospermeae informal Lacunate leaf leaf
	very rare

	Angiospermeae informal Leaf type I leaf
	very rare

	Angiospermeae informal Leaf type II leaf
	very rare

	Angiospermeae informal Leaf type III leaf
	very rare

	Angiospermeae informal Leaf type IV leaf
	very rare

	Angiospermeae informal Leaf type V leaf
	very rare

	Angiospermeae informal Leaf type VI leaf
	very rare

	Angiospermeae informal Leaf type VII leaf
	very rare

	Angiospermeae informal Leaf type VIII leaf
	rare

	Angiospermeae informal Leaf type IX leaf
	rare

	Angiospermeae informal Leaf type X leaf
	very rare

	Angiospermeae informal Leaf type XI leaf
	very rare
Amphibia - Temnospondyli - Urodela

	Urodela indet. (Duméril 1805)	Gardner and DeMar 2013
Actinopteri

	Joffrichthys triangulpterus n. sp. Newbrey and Bozek 2000	Newbrey and Bozek 2000
	osteoglossid fish
Pinopsida - Pinales - Taxodiaceae

	cf. Parataxodium sp. sterile axis, fertile axis Arnold and Lowther 1955
	leafy shoots (common), ovulate cones (occasional), pollen cones (common), seeds (rare)
Angiospermae

	Monocotyledoneae informal leaf fragments leaf
	very rare
Angiospermae - Araceae

	Porosia verrucosa leaf (Lesquereux 1878)
	occasional
Angiospermae - Trochodendrales - Trochodendraceae

	Nordenskioldia borealis leaf, seed/fruit Heer 1870
	fruits (occasional), dispersed achenes (very common), leaves (abundant)

	Nordenskioldia borealis seed/fruit Heer 1870	Crane and Manchester 1991
	Emend
Angiospermae - Proteales - Platanaceae

	Platanaceae informal Leaf type A leaf
	rare

	Platanaceae informal Leaf type B leaf
	rare

	Platanaceae informal Leaf type C leaf
	rare

	Platanaceae informal Staminate inflorescences fertile axis
	very rare

	Platanaceae informal infructescences seed/fruit
	occasional
Angiospermae - Ranunculales - Menispermaceae

	Canticocculus sp. seed/fruit Chandler 1961
	fruits (very rare)
Angiospermae - Dipsacales - Caprifoliaceae

	cf. Viburnum antiquum leaf (Newberry 1868)
	original and current combination Tilia antiqua
	common
Angiospermae - Icacinales - Icacinaceae

	Palaeophytocrene sp. seed/fruit Reid and Chandler 1933
	fruits (very rare)
Angiospermae - Cornales - Cornaceae

	Nyssidium articum leaf, fertile axis
	follicles (rare), leaves (very rare), staminate inflorescences (very rare)

	Cornus sp. Linnaeus 1753
	rare
Angiospermae - Oxalidales - Oxalidaceae

	Averrhoites affinis leaf (Newberry 1868)
	rare
Angiospermae - Fagales - Juglandaceae

	Cyclocarya brownii seed/fruit, leaf
	fruits (abundant), leaves (occasional)
Angiospermae - Myrtales - Myrtaceae

	? Psidium sp. seed/fruit Linnaeus 1753
	fruits + seeds (occasional)
Ginkgoopsida - Ginkgoales - Ginkgoaceae

	Ginkgo adiantoides leaf, seed/fruit (Unger 1845)
	original and current combination Salisburia adiantoides
	leaves (very common), seeds (common)
unclassified

	Palaeocarpinus sp. leaf, seed/fruit Crane 1981
	infructescences + fruits (abundant), staminate inflorescences (common), leaves (abundant)
see common names

Geography

Country:	United States	State/province:	North Dakota	County:	Morton
Coordinates:	46.9° North, 101.4° West (view map)
Paleocoordinates:	51.1° North, 81.3° West
Geographic resolution:	outcrop

Time

Period:	Paleogene
10 m.y. bin:	Cenozoic 1-2
*Period:	Tertiary	*Epoch:	Late/Upper Paleocene
*Local age/stage:	Clarkforkian - Clarkforkian
Key time interval:	Clarkforkian
Age range of interval:	56.20000 - 54.90000 m.y. ago
* legacy (obsolete) database fields

Stratigraphy

Formation:	Fort Union	Member:	Sentinel Butte
Stratigraphic resolution:	bed
Stratigraphy comments: ETE dating method: time_unit, ETE age comment: .

Lithology and environment

Primary lithology:	brown,yellow lithified cherty/siliceous "shale"
Includes fossils?	Y
Environment:	lacustrine indet.

Taphonomy

Modes of preservation:	mold/impression,permineralized,replaced with silica
Size of fossils:	macrofossils
Preservation of anatomical detail:	excellent

Collection methods and comments

Collection excludes:	all microfossils
Collection methods:	selective quarrying,field collection,survey of museum collection
Reason for describing collection:	taxonomic analysis
Collection method comments: ETE Size: .; ETE reference list: 122, 121, 88, ; ETE museum list:
Taxonomic list comments:Relative abundance: abundant (>120 specimens), very common (60 - 90), common (30 - 59), occasional (16 - 29), rare (6 - 15), very rare (1 - 5).

Metadata

Also known as:	ETE Locality 180, Almont,
Database number:	21372
Authorizer:	S. Wing, H. Wang, P. Holroyd, J. Alroy	Enterer:	S. Wing, H. Sims, J. Alroy, P. Holroyd, H. Wang
Modifier:	M. Carrano	Research group:	paleobotany
Created:	1992-10-14 00:00:00	Last modified:	2021-11-15 13:55:40
Access level:	the public	Released:	1992-10-14 00:00:00
Creative Commons license:	CC BY

Reference information

Primary reference:

4741.

ETE 422

P. R. Crane, S. R. Manchester, and D. L. Dilcher. 1990. A Preliminary Survey of Fossil Leaves and Well-Preserved Reproductive Structures from the Sentinel Butte Formation (Paleocene) near Almont, North Dakota. Fieldiana, Geology, New Series 20 [S. Wing/S. Wing/M. Uhen]

Secondary references:

8553		P. R. Crane and S. R. Manchester. 1991. Reproductive and vegetative structure of Nordenskioldia (Trochodendraceae), a vesselless dicotyledon from the Early Tertiary of the northern hemisphere. American Journal of Botany 78(10):1311-1334 [H. Wang/M. Arakaki/M. Arakaki]
65027		J. D. Gardner and D. G. DeMar. 2013. Mesozoic and Palaeocene lissamphibian assemblages of North America: a comprehensive review. Palaeobiodiversity and Palaeoenvironments 93:459-515 [P. Holroyd/P. Holroyd/M. Carrano]
6834		M. G. Newbrey and M. A. Bozek. 2000. A new species of Joffrichthys (Teleostei: Osteoglossidae) from the Sentinel Butte Formation, (Paleocene) of North Dakota, USA. Journal of Vertebrate Paleontology 20(1):12-20 [J. Alroy/J. Alroy/J. Alroy]