“The Long-Neck Icon of the Carnegie Collection”
Binomial Diplodocus longus · dih-PLOD-uh-kus
Late Jurassic · 155-145 Ma
IllustrationDiplodocus fossil records in Fossil Atlas are mapped as selected modern discovery locations, with 311 source-backed records currently shown. Known from Morrison Formation records in the western United States, especially classic sauropod-bearing Jurassic localities. Key mapped formations in the current dataset include Morrison Formation, Morrison Fm, Morrison. These pins are fossil record locations, not a complete ancient habitat map.
Diplodocus was a long-necked sauropod dinosaur from the Late Jurassic Morrison Formation. Its extremely long neck and tail give it one of the most recognizable dinosaur outlines. Fossil Atlas maps selected modern fossil discovery records and uses Diplodocus to strengthen the sauropod side of the Morrison ecosystem.
Drawn true to scale on a metre ruler.
Length
measured24 m · 79 ft
Largest known specimens
Height
measured5.0 m · 16 ft
Body mass
estimate12,000 kg · 26,500 lb
Typical adult
Top speed
estimate16 km/h · 10 mph
Modelled, debated
Teeth
measured≈ 50
Brain : body (EQ)
estimate0.2
Encephalization quotient
Diplodocus was among the longest dinosaurs in the Morrison Formation, though much of that length was neck and tail rather than body. Its feeding ecology has been debated: the skull is low and the teeth are peg-like, confined to the front of the jaw, suggesting it stripped leaves rather than browsed selectively. Whether it held its neck elevated or mostly horizontal is still argued, with biomechanical evidence supporting a range of postures.
The neck
Long but lightly built, with air-filled vertebrae. Studies of muscle attachment and joint mobility suggest the neck could reach high but that the resting posture was probably more horizontal.
The tail
Very long and tapering to a narrow tip, possibly ending in a whip-like section capable of producing a cracking sound, though direct evidence for this use is limited.
Teeth
Peg-like teeth confined to the front of the mouth, good for raking leaves from branches rather than grinding. No teeth at the back of the jaw.
The Carnegie casts
Andrew Carnegie funded copies of a Diplodocus skeleton sent to museums across Europe and South America in the early 1900s, making it one of the first dinosaurs widely seen outside North America.
Position of this animal’s known range across 252 million years of the Mesozoic and beyond.
155-145 million years ago
Diplodocus had one of the longest silhouettes in the Morrison Formation.
Its tail may have ended in a long, narrow whip-like section.
Diplodocus makes the Morrison sauropod story much easier to compare with Apatosaurus.
The famous Carnegie casts made Diplodocus a museum icon worldwide.
Benjamin Mudge and Samuel Wendell Williston collected the first material in 1877, and Marsh named it the same year. The Carnegie Museum's excavations in the early 1900s, driven partly by Andrew Carnegie's personal interest, produced the skeleton that became the basis for the famous casts distributed to museums worldwide. Those casts established Diplodocus as a public icon of palaeontology long before most people had access to a natural history museum.
Animals known from the same deposits and time as Diplodocus.
Allosaurus
The dominant predator of the Morrison Formation, large enough to threaten juvenile sauropods.
Camarasaurus
The most common Morrison sauropod, with different teeth and probably a different feeding niche from Diplodocus.
Stegosaurus
A plated herbivore sharing the same floodplain ecosystem, occupying a low-browsing niche Diplodocus probably did not use.
Other members of Diplodocidae.
Apatosaurus
The most closely related major Morrison sauropod, heavier and more robustly built, sometimes confused with Diplodocus in older literature.
Brachiosaurus
A very different sauropod from the same ecosystem, with long forelimbs and a more upright neck posture suited to high browsing.
Barosaurus
A closely related diplodocid with an even longer neck, known from both North America and Tanzania.
Pins show selected fossil records for Diplodocus; use them as modern discovery evidence, not a complete range map. Modern fossil discovery map: pins show where selected fossil and specimen records were found today, not ancient Earth positions. What does this mean?
Specimen evidence
These are sourced specimen assets, separate from reconstruction artwork. Only media with clear open or reusable rights is displayed by default.
USNM PAL 337914_1
Michael Brett-Surman
USNM V 4717
Michael Brett-Surman
USNM PAL 337914_2
Michael Brett-Surman
USNM PAL 337908
Michael Brett-Surman
Diplodocus is represented here by selected fossil records from known from morrison formation records in the western united states, especially classic sauropod-bearing jurassic localities. Fossil Atlas maps those records as modern discovery locations.
No. The map shows modern fossil discovery locations from selected records. Ancient habitat and paleogeographic reconstructions are separate questions.
The current Fossil Atlas records include Morrison Formation. Formation coverage depends on the selected dataset and may not be complete.
Yes. Use the expedition card generator to turn the Diplodocus map and specimen profile into a shareable card.
Selected fossil records from PBDB and museum biodiversity aggregators. This is not a complete fossil count by country; source labels and confidence notes help distinguish canonical paleobiology records from specimen-media records.
Reconstruction images are labeled illustrations and do not represent fossil evidence. Size, speed, and bite-force figures are typical published estimates and remain subject to revision as new specimens are described.
Maps use curated PBDB, museum, and specimen-source records with visible caveats.
Pins show where fossils were found or reported today, not exact ancient habitat positions.
Artwork is labeled separately from specimen photos, maps, and source records.
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