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Dinosaurs of the Lost Continent | Dr. Scott Sampson, Paleontologist
Dinosaurs of the Lost Continent | Dr. Scott Sampson, Paleontologist
Published: 2016/05/05
Channel: Burke Museum
Dinosaur Discoveries Laramidia
Dinosaur Discoveries Laramidia
Published: 2015/03/22
Channel: Michael Vespia
Western Interior Seaway
Western Interior Seaway
Published: 2016/08/31
Channel: WikiWikiup
Laramidia
Laramidia
Published: 2016/03/15
Channel: Various Artists - Topic
Laramidia
Laramidia
Published: 2016/11/03
Channel: Various Artists - Topic
LARAMIDIA paleo talks ep.14
LARAMIDIA paleo talks ep.14
Published: 2016/05/13
Channel: paleo man
WELCOME TO LARAMEDIA
WELCOME TO LARAMEDIA
Published: 2016/01/23
Channel: Matthew Laraway
Documentaries - Bigger Than T.Rex: Spinosaurus
Documentaries - Bigger Than T.Rex: Spinosaurus
Published: 2017/04/19
Channel: luyen ngoc
Dinosaur Train S3EP25 - Back in Time HD
Dinosaur Train S3EP25 - Back in Time HD
Published: 2016/03/18
Channel: CobraGamesCartoons HD
Dinosaur Train ~ Dinosaur Big City Part 1 #2
Dinosaur Train ~ Dinosaur Big City Part 1 #2
Published: 2017/04/18
Channel: Mote Fers
DIA DAS MAES - video homenagem Marcelo Lara Midia
DIA DAS MAES - video homenagem Marcelo Lara Midia
Published: 2017/05/26
Channel: Marcelo Lara Midia
Troodon Night Train - Dinosaur Train - The Jim Henson Company
Troodon Night Train - Dinosaur Train - The Jim Henson Company
Published: 2015/08/05
Channel: The Jim Henson Company
How to Pronounce Laramidia
How to Pronounce Laramidia
Published: 2015/02/25
Channel: Pronunciation Guide
Dinosaur Train ~ Dinosaur Big City Part 2 #2
Dinosaur Train ~ Dinosaur Big City Part 2 #2
Published: 2017/04/18
Channel: Mote Fers
FESTA 15 ANOS - Barbara Marques - Trailer Marcelo Lara Midia
FESTA 15 ANOS - Barbara Marques - Trailer Marcelo Lara Midia
Published: 2017/05/26
Channel: Marcelo Lara Midia
Plate Tectonics in action
Plate Tectonics in action
Published: 2010/10/25
Channel: Fudd
Dinosaur big city Dinosaur train season 2 song
Dinosaur big city Dinosaur train season 2 song
Published: 2017/06/09
Channel: Diana Sawicka
Dinosaur Big City Part 1/2
Dinosaur Big City Part 1/2
Published: 2015/09/21
Channel: PBS Shows
DINOSAUR TRAIN | Buddy and Dennis Become Friends! | PBS KIDS
DINOSAUR TRAIN | Buddy and Dennis Become Friends! | PBS KIDS
Published: 2017/04/10
Channel: PBS KIDS
Why did T - Rex have Tiny Arms? - Science of Animals
Why did T - Rex have Tiny Arms? - Science of Animals
Published: 2017/11/13
Channel: Christensn Brendan.
Dinosaur Big City Part 3/4
Dinosaur Big City Part 3/4
Published: 2015/09/21
Channel: PBS Shows
Tyrannosaurus speaks
Tyrannosaurus speaks
Published: 2012/08/11
Channel: cashiscream
Eliza  Cate
Eliza Cate's Tyrannosaurus Presentation
Published: 2014/04/24
Channel: Project 45+ (Aust)
LONDON MUSIC PUB - TRAILER FESTA
LONDON MUSIC PUB - TRAILER FESTA
Published: 2017/05/28
Channel: Marcelo Lara Midia
Paleo Speedsketching Test 34# Nasutoceratops
Paleo Speedsketching Test 34# Nasutoceratops
Published: 2017/03/08
Channel: Joschua Knüppe
Tirex
Tirex
Published: 2017/04/04
Channel: Jean-Michel Raynal
TOP 10 WEIRD Looking DINOSAURS
TOP 10 WEIRD Looking DINOSAURS
Published: 2015/11/24
Channel: Mega Top Tens
Lythronax: Dinosaur of the Day
Lythronax: Dinosaur of the Day
Published: 2016/05/17
Channel: I Know Dino
Lythronax: I Know Dino Podcast Episode 52
Lythronax: I Know Dino Podcast Episode 52
Published: 2016/05/17
Channel: I Know Dino
BEIRA-RIO - Clipe 15 anos Rafaela
BEIRA-RIO - Clipe 15 anos Rafaela
Published: 2017/09/30
Channel: Marcelo Lara Midia
VT CIC Blumenau dias das Crianças 2009
VT CIC Blumenau dias das Crianças 2009
Published: 2009/12/22
Channel: Semper Creative
T-REX VS GODZILLA | BEST SCENES MASHUP HD ✔
T-REX VS GODZILLA | BEST SCENES MASHUP HD ✔
Published: 2016/11/14
Channel: /SMASHED LEGENDS
Descubren una nueva especie de tiranosaurio
Descubren una nueva especie de tiranosaurio
Published: 2013/11/08
Channel: Chumy Chamy
Dinosaur prank - Tyrannosaurus Rex
Dinosaur prank - Tyrannosaurus Rex
Published: 2015/07/01
Channel: NikoLas Vegas
EP 31 : Công viên Khủng Long - Tyrannosaurus - T-Rex : Khủng Long Bạo Chúa
EP 31 : Công viên Khủng Long - Tyrannosaurus - T-Rex : Khủng Long Bạo Chúa
Published: 2017/10/26
Channel: THÀNH PM
RUSSIA WARNS? WHY DO THEY CARE? ITS COM
RUSSIA WARNS? WHY DO THEY CARE? ITS COM'N FROM BENEATH AMERICA!
Published: 2017/09/26
Channel: WheepingWillow2
Kosmoceratops - Video Learning - WizScience.com
Kosmoceratops - Video Learning - WizScience.com
Published: 2015/08/05
Channel: Wiz Science™
"Into the Past" Ep 2 - Nasutoceratops
"Into the Past" Ep 2 - Nasutoceratops
Published: 2015/07/30
Channel: The Paleo Archive
What Kind Of Dinosaurs Lived In North America?
What Kind Of Dinosaurs Lived In North America?
Published: 2017/09/11
Channel: Silly Question
Tyrannosaurus - Video Learning - WizScience.com
Tyrannosaurus - Video Learning - WizScience.com
Published: 2015/08/05
Channel: Wiz Science™
2 Dome Headed Dinosaurs the Size of German Shepherds Discovered
2 Dome Headed Dinosaurs the Size of German Shepherds Discovered
Published: 2017/06/13
Channel: 21 News
Porto Seguro - Trânsito + Gentil
Porto Seguro - Trânsito + Gentil
Published: 2015/06/22
Channel: Juliana Ladeira
Who
Who's the alpha?
Published: 2016/06/16
Channel: Family FUnny
Dinosaur with
Dinosaur with 'Bent Sword' Head Spikes Unearthed in Utah
Published: 2017/06/17
Channel: 21 News
Top 10 Classic And Oldest Dinosaur Species
Top 10 Classic And Oldest Dinosaur Species
Published: 2014/05/12
Channel: Animal Breeds
T.Rex Was Likely an Invasive Species
T.Rex Was Likely an Invasive Species
Published: 2017/06/18
Channel: 21 News
T-Rex Cỗ Xe Tăng Hạng Nặng Thời Tiền Sử - ARK Ragnarock #3
T-Rex Cỗ Xe Tăng Hạng Nặng Thời Tiền Sử - ARK Ragnarock #3
Published: 2017/07/02
Channel: Thành EJ
New
New 'King of Gore' Dinosaur Reveals T.Rex Lineage
Published: 2017/06/24
Channel: 21 News
GP - "Campanha de Trânsito", da OpusMúltipla para Prefeitura de Curitiba (1/4)
GP - "Campanha de Trânsito", da OpusMúltipla para Prefeitura de Curitiba (1/4)
Published: 2014/01/13
Channel: Prêmio Colunistas Paraná
Science × Rhymes (#16) Dino Fossils
Science × Rhymes (#16) Dino Fossils
Published: 2015/07/23
Channel: Science With Tom
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WIKIPEDIA ARTICLE

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Laramidia, circa 100 MYA

Laramidia was an island continent that existed during the Late Cretaceous period (99.6–66 Ma), when the Western Interior Seaway split the continent of North America in two. In the Mesozoic era, Laramidia was an island land mass separated from Appalachia to the east by the Western Interior Seaway. The seaway eventually shrank, split across the Dakotas, and retreated towards the Gulf of Mexico and the Hudson Bay. The masses joined to unite the North American continent.

The name was coined by J. David Archibald in 1996.[1][2]

Geography[edit]

Laramidia stretches from modern-day Alaska to Mexico.[3] The area is rich in dinosaur fossils. Tyrannosaurs, dromaeosaurids, troodontids, hadrosaurs, ceratopsians (including Kosmoceratops and Utahceratops[4]), pachycephalosaurs, and titanosaur sauropods are some of the dinosaur groups that lived on this landmass.

Range[edit]

Vertebrate fossils have been found in the region from Alaska to Coahuila.[4][5][6][7]

Fauna[edit]

From the Turonian age of the Late Cretaceous to the very beginning of the Paleocene, Laramidia was separated from Appalachia to the east. As a result, the fauna evolved differently on each land mass over that time. Geological conditions were generally favorable for the preservation of fossils in Laramidia, making the western United States one of the most productive fossil regions in the world. Less is known about Appalachian biodiversity in the Cretaceous as few fossiliferous deposits exist in the region today and half of the fossil beds in Appalachia were destroyed during the Pleistocene ice age. However, fossil beds which haven't been discovered yet could exist in areas of the former Appalachian continent.

In western North America during the Cretaceous the dominant predators were the tyrannosaurs, huge predatory theropods with proportionately massive heads built for ripping flesh from their prey. In Laramidia the top of the terrestrial food chain was occupied by the theropods of Tyrannosaurinae such as Tyrannosaurus rex, Nanuqsaurus hoglundi,[8] Daspletosaurus, Teratophoneus, and theropods of Albertosaurinae such as Albertosaurus and Gorgosaurus, all being included under the same family of Tyrannosauridae and not actually contemporary. The bodies of tyrannosaurs exhibited huge heads and legs, in contrast to proportionally tiny arms. The teeth exhibited in this family are rather comparable to railroad spikes and would have helped inflict major damage on prey.

Another common group of North American dinosaurs were the hadrosaurs. The fossil record shows a staggering variety of hadrosaur forms in Laramidia.

Other differences in genera appear between the island land masses. Sauropods roamed Laramidia during the Cretaceous after apparently dying out in Appalachia. Nodosaurs, though, appear to have been more plentiful in Appalachia. Nodosaurs were large, herbivorous armored dinosaurs resembling armadillos. They were scarce in Laramidia by the late Cretaceous, existing only in specialized forms like Edmontonia and Panoplosaurus while nodosaurs were thriving in Appalachia.

References[edit]

  1. ^ Archibald, J. David; Dinosaur Extinction and the End of an Era: What the Fossils Say, New York, NY: Columbia University Press, 1996
  2. ^ Laramidia is named for Laramie, Wyoming, located in the former landmass.
  3. ^ MSN, "Amazing Horned Dinosaurs Discovered" (23-Sep-2010) Accessed 23-Sep-2010.
  4. ^ a b Scott D. Sampson; Mark A. Loewen; Andrew A. Farke; Eric M. Roberts; Catherine A. Forster; Joshua A. Smith; Alan L. Titus (2010). "New Horned Dinosaurs from Utah Provide Evidence for Intracontinental Dinosaur Endemism". PLoS ONE. 5 (9): e12292. Bibcode:2010PLoSO...512292S. doi:10.1371/journal.pone.0012292. PMC 2929175Freely accessible. PMID 20877459. 
  5. ^ Rozell, Ned. Geophysical Institute, UAF - Alaska Science Forum, "Shedding light on Arctic dinosaurs, Alaska Science Forum, Article #1737" (10-Feb-2005) Accessed 14-Nov-2011.
  6. ^ U.S. Department of the Interior, Bureau of Land Management, Alaska, Resources, Environmental Education, "Dinosaurs on Alaska's North Slope" (30-May-2008) Accessed 14-Nov-2011.
  7. ^ "Hallan en Coahuila cementerio de dinosaurios" (in Spanish). El Universal. Retrieved 25 April 2015. 
  8. ^ "A Diminutive New Tyrannosaur from the Top of the World" (12-Mar-2014) Accessed 12-Mar-2014.

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