A Bacia de Sergipe apresenta uma sucessão estratigráfica completa e rica fauna fóssil. No intervalo Cenomaniano Superior, um grande evento transgressivo proporcionou a instalação da Formação Cotinguiba (Cretáceo Superior), caracterizada pela deposição de um conjunto de rochas carbonáticas com gênese associada à um ambiente deposicional de rampa. Litologicamente, calcilutitos e margas proximais representam o Membro Sapucari, enquanto folhelhos distais marcam o Membro Aracaju, nestas rochas os moluscos biválvios são abundantes. Este trabalho tem como principal objetivo identificar e descrever sistematicamente os moluscos da classe Bivalvia da seção Pedro Gonçalves, Formação Cotinguiba, Cretáceo Superior de Sergipe. A área de estudo está localizada entre os municípios de Rosário do Catete e General Maynard, Sergipe. O material de estudo é constituído de 238 exemplares de moluscos biválvios provenientes da localidade Pedro Gonçalves. Foram identificados 27 táxons, distribuídos em 19 gêneros e 14 famílias: Cucullaeidae, Pinnidae, Inoceramidae, Plicatulidae, Pectinidae, Ostreidae, Gryphaeidae, Cardiidae, Dicerocardiidae, Corbulidae, Pholadomyidae, Pleuromyidae e Poromyidae. A seção é posicionada no intervalo Turoniano médio baseada na fauna de biválvios inoceramídeos
Trilobites inhabited all environments of Paleozoic seas, ranging from estuaries to continental slopes, and were globally distributed. Although their functional morphology and phylogenetic relations are established by well-preserved body fossils, the behavior of trilobites has received less attention. Three well-known trace fossils are interpreted to be produced by trilobitomorphs when preserved in Paleozoic rocks, Rusophycus (a resting trace), Cruziana (a furrowing trace), and Diplichnites (a locomotion trace). Those trace fossils unveil some aspects of trilobite behavior, but they were not investigated to test paleoecologic strategies based on morphometric parameters. This study uses Rusophycus to access the paleoecologic strategies of trilobites in storm-dominated shallow marine deposits of the Pimenteira and Cabeças formations (Middle to Upper Devonian, Parnaíba Basin, Brazil). It was conducted a detailed analysis of the Rusophycus specimens in a section that represents the transition between the Pimenteira and Cabeças formations (Parnaíba Basin). The width and length of the Rusophycus were measured, and statistical analyses were performed to understand the population characteristics. Relatively small-sized Rusophycus are dominant in such deposits, suggesting the dominance of young tracemakers and inferred r-strategist populations. The here reported multiple-Rusophycus assemblage reveals paleoecologic strategies of the population, and tiers relationship (cross-cutting epistratal and shallow-tier trace fossils such as Bergaueria, Palaeophycus, and Protopaleodictyon) indicate deep Rusophycus. The main reason for those burrowing activities deep in the substrate might be protection during ecdysis. Thus, the random distribution, lack of hunting evidence, and depth of Rusophycus suggest molting activity as the trigger for their production in storm-influenced beds of the Pimenteira Formation, probably by calmoniids or homalonotids.
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