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Abstract Detail

Campanian-Maastrichtian floras on Laramidia: vegetation trends west of the seaway

Estrada-Ruiz, Emilio [1], Upchurch, Jr., Garland [2], Wheeler, Elisabeth [3], Mack, Greg [4].

Late Cretaceous angiosperm woods from McRae Formation, south-central New Mexico, USA: Part II.

Over the past three decades, angiosperm woods have been reported from the Campanian to Maastrichtian of Coahuila and Chihuahua, Mexico, and Big Bend National Park, Texas. Recent investigations of the upper Campanian (76 -74 mya) Jose Creek Member of the McRae Formation, south-central New Mexico, U.S.A., indicate an abundant record of well-preserved silicified woods that, when fully published, will comprise one of the most diverse Cretaceous wood floras in the world. Published descriptions of angiosperm woods from the Jose Creek Member include early records of Celastraceae and Myrtaceae, and a magnoliid with similarities to Annonaceae. In this report we describe four new angiosperm wood taxa, which comprise a magnoliid belonging to Lauraceae and three eudicots with different levels of comparability to extant orders and families. A new species of Ulminium has a combination of features that occurs in multiple extant genera, these genera are in a group variously referred to as Cinnamomeae Nees, Laureae Maout & Decaisne, or Lauroideae Burnett / core of Lauraceae. McRae Wood Type 2 has many features in common with Dilleniaceae, but differs in having narrower rays. McRae Wood Type 3 has a suite of features seen in multiple families of Malpighiales. McRae Wood Type 4 has a suite of features found in different genera of Dilleniales, Ericales, and Malpighiales. All wood types, with the exception of type 3, have minimum axis diameters greater than 10 cm (12 - 50 cm), indicating that they represent the wood of trees. This reinforces previous evidence for the presence of small to large angiosperm trees in the Jose Creek Member, and underscores the importance of woody angiosperms in vegetation of the southern Western Interior during the Campanian - Maastrichtian.

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1 - Instituto Politécnico Nacional, Departamento de Zoología, Prolongación de Carpio y Plan de Ayala s/n,, Col. Santo Tomás, Ciudad de México, MX, 11340
2 - Texas State University, Department Of Biology, 601 University Drive, San Marcos, TX, 78666, USA
3 - North Carolina State University, Department of Forest Biomaterials, Raleigh, NC, 27695, USA
4 - New Mexico State University, Department of Geological Sciences, Las Cruces, NM, 88003, USA

Angiosperm woods
fossil wood
McRae Formation
New Mexico.

Presentation Type: Colloquium Presentations
Session: CO3, Campanian-Maastrichtian floras on Laramidia: vegetation trends west of the seaway
Location: Sundance 3/Omni Hotel
Date: Wednesday, June 28th, 2017
Time: 10:30 AM
Number: CO3008
Abstract ID:56
Candidate for Awards:None

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