scholarly journals THE METATHERIA FROM THE RÍO SANTA CRUZ (SANTA CRUZ FORMATION, EARLY-MIDDLE MIOCENE, ARGENTINA): HISTORY AND NEW RECORDS

2020 ◽  
Author(s):  
Laura Chornogubsky ◽  
María Abello ◽  
Germán Barmak
Keyword(s):  
Middle Miocene ◽  
New Records ◽  
Santa Cruz

Middle Miocene recovery of Caribbean reef corals: New data from the Tamana Formation, Trinidad

2001 ◽  
Vol 75 (3) ◽  
pp. 513-526 ◽  
Author(s):  
Kenneth G. Johnson
Keyword(s):  
Middle Miocene ◽  
New Records ◽  
Early Miocene ◽  
Early Pleistocene ◽  
Reef Corals ◽  
Rigorous Description ◽  
Caribbean Coral Reef ◽  
The Caribbean ◽  
Stratigraphic Ranges ◽  
Biotic Change

Caribbean coral reef communities were restructured by episodes of accelerated biotic change during the late Oligocene/early Miocene and the late Pliocene/early Pleistocene. However, rigorous description of the effects of rapid biotic change is problematic because preservation and exposure of coral-bearing deposits is not consistent in all stratigraphic intervals. In the Caribbean, early and middle Miocene exposures are more rare than late Miocene and Pliocene exposures. One exception is the late early to early middle Miocene Tamana Formation of Trinidad, and old and new collections from this unit were studied to determine the timing of recovery after the Oligocene/Miocene transition. A total of 41 species of zooxanthellate corals were recovered from the unit, including 21 new records. Within these assemblages, species first occurrences outnumber species last occurrences by a factor of four (31 first occurrences and eight last occurrences). The extension of the stratigraphic ranges of species previously first recorded in Pliocene sediments has reduced an apparent Pliocene pulse of origination, indicating that the Pliocene/Pleistocene transition was largely a result of accelerated extinction against a background of near-constant origination. The fact that few species last occur in the Tamana fauna indicates that the Oligocene/Miocene transition was complete by the end of the early Miocene.

A PRELIMINARY ANNOTATED LIST OF THE COLLEMBOLA OF SANTA CRUZ COUNTY, CALIFORNIA

1984 ◽  
Vol 116 (2) ◽  
pp. 183-188 ◽  
Author(s):  
Suzanne F. Muzzio
Keyword(s):  
New Records ◽  
Santa Cruz ◽  
Annotated List

AbstractForty-three species of Collembola were found, 37 of which were new records for the county.

scholarly journals New records of bats (Chiroptera) from Santa Cruz province (Argentina) and the southernmost record of Lasiurus varius (Poeppig, 1835) for Argentina

Check List ◽  
2017 ◽  
Vol 13 (5) ◽  
pp. 397-401 ◽  
Author(s):  
M. Mónica Díaz ◽  
Alejandro Valenzuela ◽  
Silvina Sturzenbaum ◽  
Ruben M. Barquez
Keyword(s):  
New Records ◽  
Santa Cruz

scholarly journals The biochronology and palaeobiogeography of Baru (Crocodylia: Mekosuchinae) based on new specimens from the Northern Territory and Queensland, Australia

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3458 ◽  
Author(s):  
Adam M. Yates
Keyword(s):  
Middle Miocene ◽  
New Records ◽  
Drainage System ◽  
Northern Territory ◽  
Valid Species ◽  
Late Oligocene ◽  
Drainage Basins ◽  
Local Fauna ◽  
The North ◽  
North Western

New records of the Oligo–Miocene mekosuchine crocodylian, Baru, from Queensland and the Northern Territory are described. Baru wickeni and Baru darrowi are accepted as valid species in the genus and their diagnoses are revised. Both species are present in Queensland and the Northern Territory but are restricted in time, with B. wickeni known from the late Oligocene and B. darrowi from the middle Miocene. The broad geographic distributions and restricted time spans of these species indicate that this genus is useful for biochronology. The record of B. wickeni from the Pwerte Marnte Marnte Local Fauna in the Northern Territory establishes that the species inhabited the north-western margin of the Lake Eyre Basin (LEB) drainage system. More southerly Oligo–Miocene sites in the LEB contain only one crocodylian species, Australosuchus clarkae. The Pwerte Marnte Marnte occurrence of B. wickeni indicates that the separation of Baru and Australosuchus did not correspond with the boundaries of drainage basins and that palaeolatitude was a more likely segregating factor.

SPARASSODONTA (METATHERIA) COPROLITES FROM THE EARLY-MID MIOCENE (SANTACRUCIAN AGE) OF PATAGONIA (ARGENTINA) WITH EVIDENCE OF EXPLOITATION BY COPROPHAGOUS INSECTS

Palaios ◽  
2019 ◽  
Vol 34 (12) ◽  
pp. 639-651
Author(s):  
RODRIGO L. TOMASSINI ◽  
CLAUDIA I. MONTALVO ◽  
M.SUSANA BARGO ◽  
SERGIO F. VIZCAÍNO ◽  
JOSÉ I. CUITIÑO
Keyword(s):  
Life History ◽  
Small Mammals ◽  
Trophic Interactions ◽  
Middle Miocene ◽  
Dung Beetles ◽  
Santa Cruz ◽  
Size And Shape ◽  
History Of ◽  
Bone Remains

ABSTRACT Coprolites are a useful tool to obtain information related to the life history of the producer, trophic interactions, biodiversity, paleoenvironments, and paleoclimate, among other issues. We analyze here a sample of 111 coprolites recovered from levels of the Santa Cruz Formation (lower–middle Miocene, Burdigalian–early Langhian), outcropping in different localities of the Santa Cruz Province, Patagonian Argentina. Based on size and shape, two morphotypes were identified: coprolites assigned to morphotype I vary from ovoid to subspherical in shape, while coprolites assigned to morphotype II are cylindrical in shape. Several coprolites have bone and teeth inclusions belonging to small mammals (i.e., Octodontoidea and/or Chinchilloidea rodents). Morphometry, composition, and taphonomy of the bone remains suggest that the coprolites were produced by carnivorous mammals. According to the features of the guild of carnivorous mammals from the Santa Cruz Formation, we interpret that hathliacynids and/or small borhyaenoids (Sparassodonta) are the most probable producers. Different traces recorded in the coprolites, such as borings and putative eggs, suggest that the feces were exploited by coprophagous insects, probably dung beetles, for different purposes such as feeding and possible oviposition.

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