Secrets of the Jurassic Dinosaurs turns a Wyoming bonebed into a field investigation

Secrets of the Jurassic Dinosaurs builds a two-part investigation around a fossil site in Wyoming known as the Jurassic Mile. A small area contains sauropod remains, Allosaurus bones, plant fossils and the surface of an ancient waterhole marked by ripples and footprints. The production asks how those traces came together, then follows an excavation team working against a limited field season and changing weather.

A two-part excavation story

Produced in 2023 by BBC Studios and Canada's Idéacom International, the series was made for several broadcasters. The BBC Two version is presented by Liz Bonnin; the Canadian English version uses CBC host Anthony Morgan, and French-language Canadian television has Charles Tisseyre. The producer lists several broadcast edits, including two episodes of about 52 minutes and shorter regional cuts.

This international format explains why viewers may encounter different hosts and running times under the same title. The core subject remains the Jurassic Mile: a roughly one-square-mile site where a team tries to understand a concentrated fossil assemblage. The first episode follows the remaining weeks of excavation and introduces the bones, plants and trace surfaces. The second returns to the predators, prey and circumstances of death.

What the site preserves

The Wyoming fossils belong to a Late Jurassic landscape around 150 million years old. The broader Morrison Formation records rivers, floodplains, lakes and other settings across the western United States. National Park Service accounts describe a world with ferns, cycads, horsetails and conifers, where sauropods, stegosaurs, smaller herbivores and carnivorous theropods lived alongside fish, turtles, crocodile relatives, amphibians and small mammals.

The documentary turns this broad geology into a local field question. A tail of a giant sauropod, plant remains and ripple marks each preserve a different kind of evidence. Plant fossils help characterise habitat. Rippled sediment can record moving water at the time a surface was exposed. Footprints preserve movement across that surface, though they rarely identify an individual's motive or the exact story that brought it there.

The distinction between a rock formation and one quarry matters. Morrison rocks accumulated in different environments over a long span of time. A list of animals known from the formation is not automatically a list of species that shared the exact place and moment portrayed on screen. The series' local discoveries must be considered separately from the broader regional fauna.

Allosaurus and the question of a hunt

One of the programme's dramatic questions is whether Allosaurus attacked the sauropods or fed on animals that were already dead. Tooth marks on bones and predator teeth found in the area support feeding activity. They do not, by themselves, show whether the predator killed its prey, scavenged a carcass or arrived after another event. The same mark can preserve contact without recording the sequence that caused it.

The team also discusses whether Allosaurus may have hunted cooperatively. Comparisons of skulls and brain structure can speak to sensory and behavioural possibilities, but they cannot provide direct proof of a coordinated hunt at this site. Two animals buried near one another do not automatically form a social group; water, burial and later movement can bring separate individuals together.

This uncertainty gives the series its central scientific tension. A clear television narrative wants an answer, while fossils often support several compatible explanations. The most useful scenes are those that keep the competing possibilities visible rather than turning one attractive interpretation into a certainty.

Fieldwork under pressure

The excavation footage gives time to the practical work that polished museum displays usually hide. Fossils must be exposed carefully, mapped, recorded and protected from the weather. Saws, drills and other equipment can fail, and newly uncovered material is vulnerable to wind and rain. The programme makes clear that a dig is a sequence of decisions about which evidence to remove, stabilise or leave in place.

That process also explains why specialists examine material after it leaves the field. Preparation, imaging and comparison can reveal structures that are difficult to recognise in the rock. A bonebed is not a ready-made explanation: it is a record that researchers have to document before testing how the pieces relate to one another.

Landscape and burial

The Jurassic Mile sits within a region whose rocks preserve changing rivers and floodplains. Water can transport bones, bury them quickly or expose them again. A concentration of fossils may reflect repeated deaths, a habitat attracting animals, a flood event or several processes operating at different times. The arrangement of bones, the condition of their surfaces and the sediment around them help narrow the possibilities, but a dramatic mass of remains is not automatically a single catastrophe.

By showing plants, track surfaces and dinosaur bones together, the documentary broadens attention from individual skeletons to the landscape that preserved them. This is a useful correction to screen stories that present a dinosaur as though it lived outside an ecosystem. The evidence still has limits: a footprint gives a path at one moment, while the plants and bones may record separate times within the site's history.

How the programme balances science and drama

The series has a strong investigative structure and a tangible field setting. Its questions are grounded in real material, and the production lets viewers see people argue over what a trace means. At the same time, narration and editing compress uncertainty into a watchable mystery. The episode may move from a tooth mark to the possibility of a hunt faster than the evidence alone could justify.

That does not make the programme misleading by definition. It means the audience should distinguish observation from explanation. A bone with a bite mark is direct evidence of contact; the identity of the animal, whether it was feeding or attacking, and how many predators were involved are further steps. Clear labels for these steps make a documentary more useful than a confident but unsupported answer.

Is it worth watching?

Secrets of the Jurassic Dinosaurs is a good choice for viewers who enjoy field investigations more than a procession of computer-generated encounters. Its Wyoming site supplies a coherent place for the story, and the two-part format gives the excavation room to unfold. The strongest material lies in the questions that remain open: how a bonebed formed, what a trace actually records and where a reconstruction begins.

The programme is not a complete survey of Jurassic life, nor does one site stand for every part of the Morrison Formation. It is a snapshot of one research problem and the process of making an interpretation. For other works that use fossils, fieldwork and screen reconstructions, browse the dinosaur documentaries catalogue.