Paleoecology of the Raghavapuram Shales (early cretaceous), East Coast Gondwanas, India

The fossil record of dinosaurs from the Early Cretaceous of eastern North America is scant, and only a few sediments to the east of the continent are fossiliferous. Among them is the Arundel Formation of the east coast of the United States, which has produced among the best dinosaur faunas known from the Early Cretaceous of eastern North America. The diverse dinosaur fauna of this formation has been thoroughly discussed previously, but few of the dinosaur species originally described from the Arundel are still regarded as valid genera. Much of the Arundel material is in need of review and redescription. Among the fossils of dinosaurs from this formation are those referred to ornithomimosaurs. Here, I redescribe ornithomimosaur remains from the Arundel Formation which may warrant the naming of a new taxon of dinosaur. These remains provide key information on the theropods of the Early Cretaceous of Eastern North America. The description of the Arundel material herein along with recent discoveries of basal ornithomimosaurs in the past 15 years has allowed for comparisons with the coelurosaur Nedcolbertia justinhofmanni, suggesting the latter animal was a basal ornithomimosaurian dinosaur rather than a “generalized” coelurosaur. Comparisons between the Arundel ornithomimosaur and similar southeast Asian ornithomimosaurian material as well as ornithomimosaur remains from western North America suggest that a lineage of ornithomimosaurs with a metatarsal condition intermediate between that of basal and derived ornithomimosaurs was present through southeast Asia into North America, in turn suggesting that such animals coexisted with genera having a more primitive metatarsal morphology as seen in N. justinhofmanni.

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Early Cretaceous flora from the Pranhita-Godavari Basin (east coast of India): taxonomic, taphonomic and palaeoecological considerations

Acta Palaeobotanica ◽

10.1515/acpa-2017-0005 ◽

2017 ◽

Vol 57 (1) ◽

pp. 13-32 ◽

Cited By ~ 1

Author(s):

Chopparapu Chinnappa ◽

Annamraju Rajanikanth

Keyword(s):

Plant Diversity ◽

Early Cretaceous ◽

East Coast ◽

Taxonomic Diversity ◽

East Coast Of India ◽

Abundance Patterns ◽

Godavari Basin

AbstractThe Early Cretaceous flora from the Gangapur Formation (Pranhita-Godavari Basin, east coast of India) was studied. Its plant diversity and abundance patterns were examined, and its palaeoecology and environment were interpreted, based on the micro- and macrofloras and sedimentological inputs. The flora is rich and diverse, and consists of bryophytes, pteridophytes, pteridosperms, gymnosperms and angiosperms. The microflora shows higher taxonomic diversity and abundance than the macroflora. Overall, the study indicated an abundance of conifers, particularly Podocarpaceae. The taphocoenosis of the flora comprises local to regional elements derived from riverbank, floodplain, backswamp and valley settings. Taken together, the data on the flora and sedimentology suggest that warm and humid environments prevailed.

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Mesozoic palynofloras from the Mac. Robertson shelf, East Antarctica: geological and phytogeographic implications

Antarctic Science ◽

10.1017/s0954102099000309 ◽

1999 ◽

Vol 11 (2) ◽

pp. 239-255 ◽

Cited By ~ 29

Author(s):

E.M. Truswell ◽

M.E. Dettmann ◽

P.E. O'Brien

Keyword(s):

Early Cretaceous ◽

Western Australia ◽

Continental Margin ◽

East Coast ◽

East Antarctica ◽

Eastern India ◽

Rifted Continental Margin ◽

Break Up ◽

The Antarctic

Gravity cores taken from five sites in the Nielsen basin, a sinuous trough on the Mac. Robertson shelf of the East Antarctic continental margin, have yielded non-marine palynofloras of late Early Jurassic to Early Cretaceous age. The palynomorphs occur in glacimarine muds and are thus not in situ, but the composition of the samples indicates that no mixing of individual assemblages has occurred, and that the sediments were deposited very close to outcrop of the source of the palynomorphs. The sequence is oldest at the seaward end of the Nielsen basin, and youngest near the fault-bounded landward end. It is interpreted as reflecting pre-break-up deposition on a passive, rifted continental margin. The age of the assemblages has been established by comparison with the zonal scheme developed in the Perth Basin of Western Australia. Similarity of the Antarctic palynofloras with those known from basins on the east coast of India confirms continental reconstructions that show this part of East Antarctica to have been contiguous with eastern India prior to break-up. The non-marine character of the palynomorphs suggests that marine conditions in this region of the Antarctic margin did not develop until at least late Early Cretaceous time.

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Floristical and Palaeoecological implications of the Early Cretaceous sequences of Krishna-Godavari Basin, East coast of India

Geodiversitas ◽

10.5252/geodiversitas2018v40a12 ◽

2018 ◽

Vol 40 (3) ◽

pp. 259

Author(s):

Chopparapu H. Chinnappa ◽

Annamraju Rajanikanth

Keyword(s):

Early Cretaceous ◽

East Coast ◽

East Coast Of India ◽

Godavari Basin

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Language and Literacy Predictors of Dialect Density Among School-Age African American Children From Two Geographic Regions

Language Speech and Hearing Services in Schools ◽

10.1044/2020_lshss-19-00063 ◽

2020 ◽

Vol 51 (3) ◽

pp. 807-820

Author(s):

Lena G. Caesar ◽

Marie Kerins

Keyword(s):

African American ◽

Multiple Regression ◽

Oral Language ◽

East Coast ◽

Geographic Region ◽

Literacy Skills ◽

School Age ◽

Regression Analyses ◽

Geographic Regions ◽

American Children

Purpose The purpose of this study was to investigate the relationship between oral language, literacy skills, age, and dialect density (DD) of African American children residing in two different geographical regions of the United States (East Coast and Midwest). Method Data were obtained from 64 African American school-age children between the ages of 7 and 12 years from two geographic regions. Children were assessed using a combination of standardized tests and narrative samples elicited from wordless picture books. Bivariate correlation and multiple regression analyses were used to determine relationships to and relative contributions of oral language, literacy, age, and geographic region to DD. Results Results of correlation analyses demonstrated a negative relationship between DD measures and children's literacy skills. Age-related findings between geographic regions indicated that the younger sample from the Midwest outscored the East Coast sample in reading comprehension and sentence complexity. Multiple regression analyses identified five variables (i.e., geographic region, age, mean length of utterance in morphemes, reading fluency, and phonological awareness) that accounted for 31% of the variance of children's DD—with geographic region emerging as the strongest predictor. Conclusions As in previous studies, the current study found an inverse relationship between DD and several literacy measures. Importantly, geographic region emerged as a strong predictor of DD. This finding highlights the need for a further study that goes beyond the mere description of relationships to comparing geographic regions and specifically focusing on racial composition, poverty, and school success measures through direct data collection.

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