[F] Javelina Formation - Texas - US
Texas - US
The Javelina Formation consists of sand and mudstone interpreted as fluvial meandering channel and overbank deposits. The Javelina was apparently depostied concurrently with the onset of Laramide tectonism. Vertebrate biostratigraphy suggests a Late Maastrichtian (Lancian) to Paleocene age for this formation, and it is correlated with the nearby El Picacho Formation. The Javelina is particularly noteworthy for its paleosol horizons, which give the formation its distinct purple and grey banding.
It is overlain gradationally by the Paleocene [Black Peaks Formation], and some have suggested that these two units should be combined (along with another) into the [\\\"Tornillo Formation\\\"]. However, the boundary is mappable, and some workers insist on retaining the distinction. Within the Upper Javelina Formation lies the Cretaceous/Tertiary systemic boundary, which has been identified at at least one site in Big Bend. The contact between the Aguja Formation and Javelina is particularly difficult to pin down, and some confusion has resulted.
The upper Aguja Formation. sometimes looks alot like the lower Javelina Formation, just as apparently the top of the non-Naashoibito Kirtland Formation looks a lot like the Naashoibito Member in some areas. So there are fossils running around with tags that say \\\"Javelina\\\" but which should say \\\"Aguja.\\\" Vertebrate fossils are also rare in the Javelina Formation, and tend to be encrusted in especially unpleasant concretions.
Alamosaurus sanjuanensis - Sauropoda Titanosauria - Cretaceous Late Maastrichtian
Tyrannosaurus rex - Tyrannosauria Tyrannosauridae - Cretaceous Late Maastrichtian
Ceratopsid indet. - Ceratopia Ceratopidae - Cretaceous Late Maastrichtian
cf. Edmontosaurus sp. - Ornithopoda Hadrosauridae - Cretaceous Late Maastrichtian
cf. Torosaurus latus (= Torrosaurus utahensis) - Ceratopia Ceratopidae - Cretaceous Late Maastrichtian
Nodosaurid indet. - Ankylosauria - Cretaceous Late Maastrichtian
Ornithomimid indet. - Theropoda - Cretaceous Late Maastrichtian
The Javelina Formation consists of sand and mudstone interpreted as fluvial meandering channel and overbank deposits. The Javelina was apparently depostied concurrently with the onset of Laramide tectonism. Vertebrate biostratigraphy suggests a Late Maastrichtian (Lancian) to Paleocene age for this formation, and it is correlated with the nearby El Picacho Formation. The Javelina is particularly noteworthy for its paleosol horizons, which give the formation its distinct purple and grey banding.
It is overlain gradationally by the Paleocene [Black Peaks Formation], and some have suggested that these two units should be combined (along with another) into the [\\\"Tornillo Formation\\\"]. However, the boundary is mappable, and some workers insist on retaining the distinction. Within the Upper Javelina Formation lies the Cretaceous/Tertiary systemic boundary, which has been identified at at least one site in Big Bend. The contact between the Aguja Formation and Javelina is particularly difficult to pin down, and some confusion has resulted.
The upper Aguja Formation. sometimes looks alot like the lower Javelina Formation, just as apparently the top of the non-Naashoibito Kirtland Formation looks a lot like the Naashoibito Member in some areas. So there are fossils running around with tags that say \\\"Javelina\\\" but which should say \\\"Aguja.\\\" Vertebrate fossils are also rare in the Javelina Formation, and tend to be encrusted in especially unpleasant concretions.
Alamosaurus sanjuanensis - Sauropoda Titanosauria - Cretaceous Late Maastrichtian
Tyrannosaurus rex - Tyrannosauria Tyrannosauridae - Cretaceous Late Maastrichtian
Ceratopsid indet. - Ceratopia Ceratopidae - Cretaceous Late Maastrichtian
cf. Edmontosaurus sp. - Ornithopoda Hadrosauridae - Cretaceous Late Maastrichtian
cf. Torosaurus latus (= Torrosaurus utahensis) - Ceratopia Ceratopidae - Cretaceous Late Maastrichtian
Nodosaurid indet. - Ankylosauria - Cretaceous Late Maastrichtian
Ornithomimid indet. - Theropoda - Cretaceous Late Maastrichtian
Tyrannosaurus indet. - Tyrannosauria Tyrannosauridae - Cretaceous Late Maastrichtian