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A variety of invertebrate organisms live and feed within the soft sediment accumulating under water. The activity of these organisms, known as bioturbation, can leave traces in the sediments of the substrate. These traces can become fossilized, as is the case for this Cretaceous sandstone from the coast of Chile. The meniscate patterns in the sand are indicative of bioturbation. Surface view of bed, pencil for scale.
Succession of Upper Cretaceous and Cenozoic sediments in the Maragua syncline region, Bolivia
A fossilized example of predation. This Cretaceous fish from the Crato Formation of the Araripe Basin, Brazil, died while ingesting another fish. Specimen on display at the Paleontological Museum in Santana do Cariri, few cm in size.
Exceptional preservation of organisms without hard skeletal parts, like this spider, requires special conditions for fossilization. Spiders appear abruptly in the fossil record. This is a Cretaceous specimen (few cm in size) of Dinodiplura ambulacra from the Crato Formation of Brazil, on display at the Paleontological Museum in Santana do Cariri.
Cannibalism exhibited by the fish Dastilbe crandalli, Cretaceous Crato Fm., Brazil. Specimen on display at the Paleontological Museum in Santana do Cariri. Larger fish is about 10 cm in size. Unique environmental conditions are required for such spectacular preservation of fossil fish. This form of cannibalism is also interpreted as indicative of stressful environmental conditions.
Dinosaur trackways, the main one thought to have been left by an ankylosaurid (hammer for scale). Cretaceous El Molino Fm., Torotoro, Bolivia. Well developed fossil trackways imply a special set of conditions, with sediment wet enough for footprints to remain impressed followed by prompt induration and burial.
On the surface of this Cretaceous mudstone bed from the Sousa Basin of Brazil, one can see both polygonal cracks (indicative of subaerial exposure) and wave ripples (indicative of a thin cover of water).
Fossil branches and leaves of an araucarian tree from the Cretaceous of the Crato Basin, Brazil. On display at the Paleontological Museum of Santana do Cariri
Fossil feather from the Crato Formation, Cretaceous, Brazil. It is possible that this feather belonged to an individual of the bird species Cratoavis cearensis. Specimen on display at the Paleontological Museum of Santana do Cariri
3D preservation of pterosaur bones, in articulation, is extremely rare and requires special conditions for fossilization. This example comes from a concretion within the Cretaceous Romualdo Formation, Brazil. On display at the Paleontological Museum in Santana Do Cariri
Fossilized hatchling of a Cretaceous pleurodiran turtle from the Araripe Basin, Brazil. Specimen on display at the Paleontological Museum in Santana do Cariri, few cm in size.
Flowering plants appear abruptly in the fossil record in Mesozoic strata. Here is an example of an exquisitely preserved sycamore-like leaf from the Cretaceous of Kansas. Specimen (several cm in size) on display at the Field Museum of Natural History, Chicago.
Marginocephalians are a group of herbivorous dinosaurs found in Cretaceous layers and characterized by a bony frill at the back of their skull. This photo shows specimens of 4 different species within this group, on display at the Field Museum of Natural History, Chicago.
The body plan of fossil scorpions is not much different from modern ones: an example of morphological stasis. This is a Cretaceous example from the Crato Formation of Brazil. Specimen on display at the Paleontological Museum in Santana do Cariri, few cm in size.
Snakes appear in the fossil record in Mesozoic layers. Here is a cast of a fully articulated specimen from the Cretaceous of Bosnia-Herzegovina, on display at the Field Museum of Natural History, Chicago.
Replica of the skeleton of a Cretaceous large marine reptile, Taniwhasaurus antarcticus, on display at the Chicago Field Museum of Natural History. Remains of this reptile are found in locations both within the southern and northern hemisphere, illustrating an example of widespread distribution of a fossil type.
Dinosaurs are not the only group of organisms to disappear above Cretaceous strata. Inoceramids, a family of large bivalves, are also extinct and not found in Cenozoic layers. Remains of fish have been found preserved within some specimens of this giant clam, leading to the suggestion of possible commensalism or symbiosis. Specimen on display at the Colorado Museum of Nature and Science.