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Fruitland Formation
Stratigraphic range: Campanian
~76.3–75Ma
Sphimx at Bisti badlands.jpg
Fruitland Formation at the Bisti Wilderness
Type Geological formation
Sub-units Fossil Forest Member
Ne-nah-ne-zad Member
Underlies Kirtland Formation
Overlies Pictured Cliffs Sandstone
Lithology
Primary Sandstone
Other Shale, coal
Location
Coordinates 36°45′07″N 108°26′31″W / 36.752°N 108.442°W / 36.752; -108.442Coordinates: 36°45′07″N 108°26′31″W / 36.752°N 108.442°W / 36.752; -108.442
Approximate paleocoordinates 43°30′N 79°36′W / 43.5°N 79.6°W / 43.5; -79.6
Region  New Mexico
 Colorado
Country  USA
North america 75mya
Paleogeography of the Campanian

The Fruitland Formation is a geologic formation found in the San Juan Basin in the states of New Mexico and Colorado, in the United States of America. It contains fossils dating it to the Campanian age of the late Cretaceous.

Description

San Juan Basin Upper Cretaceous stratigraphy PeerJ e5435 fig 1
San Juan Basin Upper Cretaceous stratigraphy

The Fruitland Formation is a sedimentary geological formation containing layers of sandstone, shale, and coal. It was laid down in marshy delta conditions, with poor drainage and frequent flooding, under a warm, humid and seasonal climate.

The Fruitland is underlain by the Pictured Cliffs Sandstone, and overlain by the more recent Kirtland Formation. The sequence of rocks represents the final filling of the Cretaceous seaway. The underlying Pictured Cliffs is a marginal marine sandstone, deposited in an environment similar to offshore barrier islands of the southeast United States. As the seaway retreated, the Pictured Cliffs was covered by the Fruitland Formation, which was deposited in near-shore swampy lowlands. The formation is dated to the late Campanian (part of the Cretaceous period), and was deposited over a period of about a million years. Radiometric dating from 23 meters above the base of the formation has yielded an age of 76.03 ± 0.41 Ma ago. An ash bed lying above the upper boundary with the Kirtland Formation has been dated to 75.02 ± 0.13 Ma ago. The underlying Pictured Cliffs Sandstone would be dated 76.94 - 76.27 Ma, based on the presence of the ammonite Baculites scotti, therefore placing the base of the Fruitland Formation at ~76.3 Ma.

The formation is subdivided into the upper Fossil Forrest Member (deposited between about 75.5-75 million years ago) and the lower Ne-nah-ne-zad Member (deposited from 76.3-75.5 million years ago). The Fossil Forrest member is considered to be part of the Hunter Wash, fauna shared with the overlying lower Kirtland Formation.

Paleofauna

Ornithischians

Ornithischians of the Fruitland Formation
Genus Species Location Member Abundance Notes Images
Hadrosauridae indet. Intermediate Fossil Forest One print Giant hadrosaur track, indicating an individual larger than Shantungosaurus, the largest known hadrosaur.
Parasaurolophus P. cyrtocristatus Fossil Forest One specimen, holotype
Parasaurolophus skull FMNH.jpg
Pentaceratops P. fenestratus Junior synonym of P. sternbergii
Pentaceratops BW.jpg
P. sternbergii Fossil Forest Specimens including holotype Also found in the Kirtland Formation
Stegoceras S. novomexicanum Fossil Forest "(holotype) NMMNH P-33898, nearly complete frontoparietal" and "SMP VP-2555, greater posterior part of left frontal and anterior-most portions of left and right frontals" Also found in the lower Kirtland Formation
Stegoceras validum.jpg

Saurischians

Some remains (OMNH 10131) of Bistahieversor may actually have originated in the upper Fruitland Formation.

Saurischians of the Fruitland Formation
Genus Species Location Member Abundance Notes Images
Bistahieversor B. sealeyi Fossil Forest Rostral ramus of a right lacrimal A large eutyrannosaur, similar to tyrannosaurids. Bihastieversor NT.jpg
Dromaeosauridae Indeterminate Teeth
Ornithomimidae Indeterminate
 ?Troodontidae Indeterminate Formerly identified as Paronychodon sp., referral to Troodontidae doubtful.
Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Economic geology

The Fruitland Formation contains beds of bituminous coal that are mined in places along the outcrop. Since the 1980s, the coal beds of the Fruitland Formation have yielded large quantities of coalbed methane. The productive area for coalbed methane straddles the Colorado-New Mexico state line, and is one of the most productive areas for coalbed methane in the United States.

The methane released from the Fruitland Formation, through oil and gas production and a bit of natural seepage, contributes to the Four Corners Methane Hot Spot.

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