FIRST NORTH AMERICAN OCCURRENCES OF THE FOSSIL WOOD XENOXYLON MEISTERI FROM THE UPPER JURASSIC MORRISON FORMATION OF CENTRAL MONTANA

2017 ◽  
Author(s):  
Dean R. Richmond ◽  
◽  
Richard Lupia ◽  
Jason Klimek
Keyword(s):  
North American ◽  
Upper Jurassic ◽  
Fossil Wood ◽  
Morrison Formation ◽  
Central Montana

scholarly journals UPPER JURASSIC MORRISON FORMATION CLAMS ON THE HALF SHELL, CENTRAL MONTANA

2017 ◽  
Author(s):  
Serena M. Celestino ◽  
◽  
Dean R. Richmond ◽  
Mitchell W. Lukens
Keyword(s):  
Upper Jurassic ◽  
Morrison Formation ◽  
Central Montana

A North American freshwater sponge (Eospongilla morrisonensis new genus and species) from the Morrison Formation (Upper Jurassic), Colorado

1999 ◽  
Vol 73 (3) ◽  
pp. 389-393 ◽  
Author(s):  
Stan P. Dunagan
Keyword(s):  
North American ◽  
New Genus ◽  
Upper Jurassic ◽  
Morrison Formation ◽  
Freshwater Sponge ◽  
New Genus And Species ◽  
East Central ◽  
North American Freshwater ◽  
Lacustrine Carbonate

Eospongilla morrisonensis n. gen. and sp., the oldest-described freshwater sponge (Demospongea: Spongillidae), is found in the Upper Jurassic (?Oxfordian/Kimmeridgian to Tithonian) Morrison Formation, east-central Colorado, U.S.A. Eospongilla morrisonensis occurs within the well-developed lacustrine carbonate succession of the Morrison Formation, and is represented by two micritic body fossils with calcite-replaced megascleres that range in length from 180 to 300 μm and in diameter from 20 to 35 μm. Megascleres are simple oxeas and strongyles and lack apparent ornamentation, possibly due to the diagenetic replacement. The oxeas are straight but the strongyles display a slight curvature. Microscleres are absent; gemmoscleres were not observed.

CIRCOPOROXYLON FROM THE UPPER JURASSIC MORRISON FORMATION OF CENTRAL MONTANA

2019 ◽  
Author(s):  
Dean R. Richmond ◽  
◽  
Richard Lupia ◽  
Marc Philippe
Keyword(s):  
Upper Jurassic ◽  
Morrison Formation ◽  
Central Montana

A review of the genus Protopiceoxylon with emphasis on North American species

1979 ◽  
Vol 57 (13) ◽  
pp. 1451-1463 ◽  
Author(s):  
David A. Medlyn ◽  
William D. Tidwell
Keyword(s):  
New Species ◽  
South Dakota ◽  
North American ◽  
Large Diameter ◽  
Upper Jurassic ◽  
North American Species ◽  
Morrison Formation ◽  
Bordered Pits ◽  
Two New Species ◽  
Resin Canals

Protopiceoxylon Gothan, a genus of Mesozoic wood, is reviewed with special emphasis on three North American species. Two new species of this genus are proposed. These are Protopiceoxylon resiniferous from the Upper Jurassic Morrison Formation of Utah and Protopiceoxylon canodense from the Upper Jurassic strata of British Columbia. Protopiceoxylon dacotense from the Lower Cretaceous(?) of South Dakota is redescribed. All species of Protopiceoxylon are compared as to their xylotomy and distribution. Nine species are considered valid. The combination of characters unique for this genus includes the occurrence of only vertically formed resin canals, abietinoid pitting of the rays, and relatively large diameter of the bordered pits on the radial walls of the tracheids. Affinity of the genus with extant Keteleeria is also considered.

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