Glossary

Dinosaur Provincial Park is a provincial park and UNESCO World Heritage Site located along the Red Deer River valley in southeastern Alberta, Canada, approximately 220 kilometers east of Calgary. Encompassing approximately 7,825 hectares (73.29 square kilometers) of badlands terrain, the park preserves Upper Cretaceous (Campanian) fossil beds of the Belly River Group — primarily the Oldman Formation and the Dinosaur Park Formation — dating from approximately 76.5 to 74.3 million years ago. These strata were deposited on a low-lying subtropical coastal plain west of the Western Interior Seaway and record a 2.4-million-year interval that coincides with the zenith of global dinosaur diversity. The park contains the richest and most diverse concentration of Late Cretaceous dinosaur fossils yet discovered on Earth, with more than 166 vertebrate taxa identified — including over 50 species of non-avian dinosaurs representing every major Cretaceous dinosaur group — along with more than 75 non-dinosaurian vertebrate species and over 500 plant species. More than 500 articulated specimens, including over 150 complete skeletons, have been excavated and distributed to more than 30 museums worldwide since systematic collecting began in the 1880s. In addition to the number and quality of its fossil specimens, the park displays a landscape of badlands landforms — hoodoos, mesas, and coulees — shaped by ongoing fluvial erosion, which both expose new fossil material and create a terrain of exceptional natural beauty. Designated a World Heritage Site in 1979 under criteria vii (natural beauty) and viii (outstanding paleontological value), Dinosaur Provincial Park serves as one of the world's premier outdoor laboratories for understanding Late Cretaceous terrestrial ecosystems.

The **Morrison Formation** is an extensive sequence of Upper Jurassic sedimentary rocks distributed across the western United States, spanning approximately 1.5 million km² from Montana to New Mexico and from Idaho to Kansas. Radiometric dating of interbedded volcanic ash beds constrains its age to approximately 155–148 Ma (Britannica) or 154–145 Ma (NHM), corresponding to the Kimmeridgian through early Tithonian ages, and possibly extending into the latest Oxfordian. The formation is composed of multicoloured mudstones, sandstones, siltstones, conglomerates, and minor limestones, deposited predominantly in non-marine environments including rivers, floodplains, lakes, swamps, and alluvial plains, with some marine sediments at its base. Clastic material was sourced mainly from mountain ranges to the west, such as the Sierra Nevada, that were actively uplifting during the Late Jurassic, while numerous volcanic ash beds within the formation provided the basis for radiometric age determinations. The Morrison Formation is the most prolific source of dinosaur fossils in North America, with approximately 50 or more genera of dinosaurs described from its outcrops. Iconic taxa including *Allosaurus*, *Diplodocus*, *Apatosaurus*, *Stegosaurus*, *Brachiosaurus*, and *Camarasaurus* were all first described from this unit. The formation became the principal arena of the Bone Wars between Edward Drinker Cope and Othniel Charles Marsh beginning in 1877, an episode that catalysed the growth of vertebrate palaeontology as a scientific discipline and brought dinosaurs to widespread public attention.

The **Solnhofen Limestone** is a Late Jurassic geological formation located near the town of Solnhofen in southern Bavaria, Germany, formally designated as the **Altmühltal Formation**. Dated to the Tithonian Age (approximately 150.8–145.5 million years ago), it is one of the world's most celebrated **Konservat-Lagerstätten**—sedimentary deposits characterized by exceptional fossil preservation—including detailed impressions of soft-bodied organisms such as jellyfish, squid, and insects. The formation consists of thin beds of extremely fine-grained lithographic limestone (Plattenkalk) interbedded with thin shaly layers, deposited as calcium carbonate mud (micrite) in shallow tropical lagoons that were isolated by sponge and coral reefs along the northern margin of the Tethys Sea. Elevated salinity and anoxic bottom-water conditions in these confined lagoons suppressed scavenging and bacterial decomposition, enabling the preservation of feathers, skin impressions, and even internal organs. Over 750 plant and animal species have been described from the formation, most famously *Archaeopteryx*, the iconic transitional fossil linking theropod dinosaurs to birds. The Solnhofen Limestone also holds significance in the history of printing technology: its homogeneous, fine-grained texture made it the ideal medium for Alois Senefelder's invention of lithography in the late 1790s, and subsequent large-scale quarrying for lithographic stones led directly to many of the formation's most important fossil discoveries.