Let Xn = (xij) be an n by p data matrix, where the n rows form a random sample of size n from a certain p-dimensional population distribution. LetRn = (ρij) be the p×p sample correlation matrix ofXn; that is, the entry ρij is the usual Pearson’s correlation coefficient between the ith column of Xn and jth column of Xn. For contemporary data both n and p are large. When the population is a multi...

We present a new tracksite with multiple dinosaur tracks from the lowermost Barremian (Lower Cretaceous) of Cape Espichel (Sesimbra, Portugal). The are localized on three beds top carbonate Areia do Mastro Formation. Those bioclastic, nodular limestones were deposited in very shallow subtidal-intertidal, restricted lagoon environment. track surfaces dinoturbated, substantial number tracks. Seve...

The species Coniopteris laciniata and Sphenopteris wonnacottii are heterophyllous ferns recovered from two Spanish Barremian localities, Las Hoyas El Montsec respectively. similarities between these species, observed in a study of total 66 hand specimens both indicate that they conspecific. Following the rule priority botanical nomenclature, because there doubts about assignment this to higher ...

The Tirgan Formation (Barremian – Aptian) is exposed in the Kopet Dagh in northeast Iran. One stratigraphic section in Zavin was measured with a thickness of 110 meters. This Formation in section consists of three parts (including lower carbonate, limy shale – marl and upper carbonate rocks). Based on the study of 94 thin sections, 10 carbonate and 2 siliciclastic lithofacies have been identifi...

Internal moulds of rudist bivalves from the basal Exu Formation western Araripe Basin, northeastern Brazil, are identified as Early Cretaceous (Barremian to Aptian) radiolitidin caprinuloideid genus cf. Amphitriscoelus Harris and Hodson. The rudists occur part a sparse assemblage remané fossils in Formation, fluvial sandstone resting disconformably on Santana Group likely have been derived shal...

Oxygen and hydrogen isotope composition of neoformed clay minerals is commonly used as a palaeoclimatic proxy. Usually, sediments rocks (including palaeosols) contain not only minerals, but also detrital and/or diagenetic ones. Together with the usually small size (micro- or nanometric) in these materials, this can generate difficulties during isotopic analyses by conventional spectrometry. To ...