Lark Quarry Dinosaur Trackways

Coordinates: 23°00′58″S 142°24′41″E / 23.0161°S 142.4114°E / -23.0161; 142.4114
Source: Wikipedia, the free encyclopedia.

Amblydactylus, Wintonopus, and Skartopus dinosaur tracks at Lark Quarry.
Close-up digital image of Dinosaur Tracks at Lark Quarry.
Close-up digital image of Dinosaur Tracks at Lark Quarry.
Wide-angle photo showing some of the overburden which has been cleared and in the foreground are the dinosaur tracks.
Close-up of the overburden that covered the dinosaur tracks.
External view of Conservation Building at Lark Quarry.

Dinosaur Stampede National Monument at Lark Quarry Conservation Park (also known just as Lark Quarry or Dinosaur Stampede) in

river crossing.[2][3]

The fossils date to either the Albian or Turonian periods between 104 and 92 million years ago, and are part of the Winton Formation sandstone. In 2015, Winton Shire Council invited the Australian Age of Dinosaurs Museum of Natural History to take over the operation of public guided tours at Dinosaur Stampede National Monument. This joint initiative, implemented in April 2016, provides visitors with a broader understanding of unique Australian dinosaurs and the world they inhabited. In 2018, Dinosaur Stampede National Monument received 14,180 visitors.[citation needed]

The Lark Quarry site is about 110 km (68 mi) south-west of the western Queensland town of Winton.[4]

Origin

The traditional account is that 104 to 92 million years ago, a group of perhaps 180 chicken-sized

Skartopus (small coelurosaurs) and Wintonopus (ornithopods), while the larger tracks were referred to cf. Tyrannosauropus
and originally interpreted as a large theropod.

The Skartopus and Wintonopus trackmakers were thought to have stampeded past the cf. Tyrannosauropus trackmaker (that walked in the opposite direction), leaving thousands of footprints in lake sediment.

ichnogenus Amblydactylus instead.[7][8]

Research by Anthony Romilio and colleagues[8][2][9] casts doubt on the original interpretation. Analysis of the sediments indicates that they were deposited by a seasonal water course with water flowing at different depths and speeds at different times. The footprints were most likely made over a period of time, perhaps several days, by dinosaurs crossing the channel. The authors also found the shape variation of Skartopus and Wintonopus overlapped and were even preserved within the same individual trackway. With no significant difference in the form of the footprints, the authors attributed both Skartopus and Wintonopus were made by the same type of herbivorous bipedal dinosaur trackmakers.

Whatever actually took place, not long after the incident, the water level began to rise, covering the tracks with sandy sediments before the mud had dried. The footprints were buried beneath sand and mud as the water levels continued to rise and fall. Over thousands of millennia, the rich river plain with sandy channels, swamps and lush lowland forest dried up. The sediment covering the footprints was compressed to form rock.

Discovery and preservation

The footprints were first discovered in the 1960s by station manager, Glen Seymour, in the nearby Seymour Quarry.

Palaeontologists from the

Mary Wade and Tony Thulborn and the University of Queensland
excavated Lark Quarry during 1976–77 (the quarry was named after Malcolm Lark, a volunteer who removed a lot of the overlying rock.) All together they removed more than 60 tonnes of rock, and uncovered about 210 square metres of the layer with the fossils. This shows about 3300 dinosaur footprints.

A sheltering roof was built over the site but did not stop the gradual damage caused by exposure to the weather. The present Conservation Building that covers the

trackways
was constructed in 2002. This building protects the main collection of footprints from damage by stabilising temperature and humidity fluctuations, stops water running over the footprints and keeps people and wildlife off the footprints themselves.

The Dinosaur Stampede National Monument was included in the

Australian National Heritage List on 20 July 2004, for values of rarity and research.[10]

It has been claimed that the Lark Quarry tracks served as inspiration and "scientific underpinning" for the Gallimimus stampede scene in the film Jurassic Park; these tracks were initially interpreted as representing a dinosaur stampede caused by the arrival of a theropod predator. The idea that the tracks represent a stampede has since been contested, and a consultant to Jurassic Park has denied the tracks served as inspiration for the movie.[11][12][13]

See also

References

  1. ^ "Lark Quarry Conservation Park". National parks, marine parks, and forests. Queensland Government. Archived from the original on 13 March 2011. Retrieved 4 November 2011.
  2. ^
    S2CID 131090557
    .
  3. ^ Romilio, Anthony; Salisbury, Steven W. (14 July 2014). "No dinosaur stampede at Lark Quarry – so what really happened?". The Conversation. Archived from the original on 25 July 2014. Retrieved 5 August 2022.
  4. ^ Google (5 August 2022). "Winton to Lark Quarry Dinosaur Trackways" (Map). Google Maps. Google. Retrieved 5 August 2022.
  5. ^ "Australian National Heritage list: Department of the Environment, Water, Heritage and the Arts". Archived from the original on 18 May 2008. Retrieved 17 May 2008.
  6. ISSN 1042-0940
    .
  7. ^ Australia’s biggest carnivorous dinosaur forced to take a walk Archived 29 May 2012 at the Wayback Machine UQ News, 16 December 2010
  8. ^
    ISSN 0195-6671
    .
  9. ISSN 0195-6671
    .
  10. ^ "Lark Quarry (Place ID 105664)". Australian Heritage Database. Australian Government.
  11. ISBN 978-1605984995
    .
  12. ISSN 1442-679X. Archived
    from the original on 5 August 2022. Retrieved 2 September 2020.
  13. ^ Shapiro, A. D. (2013). "The great dinosaur stampede that never was?". BBC News. Archived from the original on 15 May 2018. Retrieved 7 May 2018.

External links

23°00′58″S 142°24′41″E / 23.0161°S 142.4114°E / -23.0161; 142.4114

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