Novel analysis of locality data can inform better inventory and monitoring practices for paleontological resources at John Day Fossil Beds National Monument, Oregon, USA

Kort, Anne E.; Famoso, Nicholas A.

doi:10.26879/1053

Cited by 1 publication

(2 citation statements)

References 13 publications

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“…Specimens were all surfacecollected from outcrops of the Turtle Cove Member of the John Day Formation through inventory and monitoring practices of JODA originally established in the 1980s and continued to the present (Kort and Famoso 2020). Many isolated specimens were likely separated from egg clusters through erosion of the bedrock.…”

Section: Methodsmentioning

confidence: 99%

“…A significant portion of JODA's fossil specimens comes from the highly fossiliferous Turtle Cove Member (ca. 31.45-26.6 Ma), yielding approximately 6,800-13,800 catalogued paleontological specimens (Kort and Famoso 2020). It consists of interbedded soft claystone, siltstone, and bluegreen zeolitized tuffaceous claystones (Fremd 2010).…”

Section: An Unusual Preservation In a Cooling And Drying Environmentmentioning

confidence: 99%

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Microtomography of an enigmatic fossil egg clutch from the Oligocene John Day Formation, Oregon, USA, reveals an exquisitely preserved 29-million-year-old fossil grasshopper ootheca

Lee,

Famoso,

Lin

2024

Parks Stewardship Forum

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Eggs are one of the least understood life stages of insects, and are poorly represented in the fossil record. Using micro tomography, we studied an enigmatic fossil egg clutch of a presumed entomological affinity from the Oligocene Turtle Cove Member, John Day Formation, from the National Park Serviceadministered lands of John Day Fossil Beds National Monument, Oregon. A highly organized egg mass comprising a large clutch size of approximately 50 slightly curved ellipsoidal eggs arranged radially in several planes is preserved, enclosed in a discshaped layer of cemented and compacted soil particles. Based on the morphology of the overall structure and the eggs, we conclude that the specimen represents a fossilized underground ootheca of the grasshoppers and locusts (Orthoptera: Caelifera), also known as an egg pod. This likely represents the oldest and the first unambiguous fossil evidence of a grasshopper egg pod. We describe Subterroothecichnus radialis igen. et isp. nov. and Curvellipsoentomoolithus laddi oogen. et oosp. nov., representing the egg pod and the eggs, respectively. We advocate for adopting ootaxonomy in studying fossil eggs of entomological affinities, as widely practiced with fossil amniotic eggs. An additional 26 individual and clustered C. laddi collected throughout the A-H subunits of the Turtle Cove Member suggest the stable presence of grasshoppers in the Turtle Cove fauna, and we discuss the paleoecological implications. Oothecae have convergently evolved several times in several insect groups; this ovipositional strategy likely contributed to the fossilization of this lesserknown ontogenetic stage, enriching our understanding of past insect life.

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Section: Methodsmentioning

confidence: 99%

Section: An Unusual Preservation In a Cooling And Drying Environmentmentioning

confidence: 99%

Microtomography of an enigmatic fossil egg clutch from the Oligocene John Day Formation, Oregon, USA, reveals an exquisitely preserved 29-million-year-old fossil grasshopper ootheca

Lee,

Famoso,

Lin

2024

Parks Stewardship Forum

View full text Add to dashboard Cite

show abstract

Novel analysis of locality data can inform better inventory and monitoring practices for paleontological resources at John Day Fossil Beds National Monument, Oregon, USA

Cited by 1 publication

References 13 publications

Microtomography of an enigmatic fossil egg clutch from the Oligocene John Day Formation, Oregon, USA, reveals an exquisitely preserved 29-million-year-old fossil grasshopper ootheca

Microtomography of an enigmatic fossil egg clutch from the Oligocene John Day Formation, Oregon, USA, reveals an exquisitely preserved 29-million-year-old fossil grasshopper ootheca

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