Complex caddisfly-dominated bioherms from the Eocene Green River Formation

Leggitt, V. Leroy; Cushman, R. A.

doi:10.1016/s0037-0738(01)00155-5

Cited by 44 publications

(49 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Liupanshan cases are significantly smaller than the Early Cretaceous counterparts reported from southern England (Jarzembowski, 1995), Siberia of Far East, Russia (Ivanov, 2006) and Liaoning of northeastern China (Huang et al, 2009). The morphologically similar caddisfly cases have also been described from the Eocene Green River Formation of the western US (Leggitt and Cushman, 2001), but they are significantly smaller than the Liupanshan cases. Paik (2005) also reported a…”

Section: Discussion 41 Comparison With Other Fossil Caddisfly Larvalsupporting

confidence: 64%

“…Their larvae inhabited in clean lentic niches and could construct conoid, portable silk cases, while the adults live in land. They are holometabolous, typically unlvoltine (Leggitt and Cushman, 2001) and generally emergent in autumn. Pupation usually requires three weeks and the adult stage lasts 3-4 weeks (Leggitt and Cushman, 2001).…”

Section: Case-makersmentioning

confidence: 99%

“…8). They often inhabited nearshore environments, like other Trichopteriods (Paik, 2005;Leggitt and Cushman, 2001). …”

Section: Case-makersmentioning

confidence: 99%

See 2 more Smart Citations

Exceptionally preserved caddisfly larval cases (Insecta) from the lower Cretaceous of the Liupanshan basin, Western China

Chen

et al. 2015

J. Earth Sci.

View full text Add to dashboard Cite

Abundant well-preserved tubular fossils of caddisfly (Insecta: Trichoptera) larval cases are reported from the Early Cretaceous Madongshan and Naijiahe formations of the Liupanshan Basin, Ningxia Province, western China. Most cases were mainly preserved in life position and densely packed in various layers. Individual cases in each layer tended to be same in size and were erect and parallel to one another and open at both ends. In a transverse section cut perpendicular to the long axis of the cases, individual case appears to form a rounded ring. Small cases are elliptic in a cross-section oblique to the long axis of the cases. Tube walls are nearly subparallel to one another in longitudinal section with both ends being open. The caudal end of the case slightly tapers and usually points downward. The cases were closely packed, almost touching with one another and lacking bifurcate or connecting structure. The overwhelming majority of cases were partially or fully filled with calcite. The case wall embraces a medium particle layer flanked by inner and outer organic layers. Individual particles are ovate in outline and comprise cryptocrystalline or ganic pellets. SEM imaging shows that those pellets are sub-cylindrical in outline and elliptic in cross section, and are made primarily of calcium carbonate. All features observed justify the assignment of the Liupanshan caddisfly cases to ichnogenus Coprindusia. The extinct insect Ningxiapsyche fangi was found in association with the Liupanshan caddisfly larval cases, and thus could be the candidate of the potential trace-maker.

show abstract

Section: Discussion 41 Comparison With Other Fossil Caddisfly Larvalsupporting

confidence: 64%

Section: Case-makersmentioning

confidence: 99%

See 1 more Smart Citation

Exceptionally preserved caddisfly larval cases (Insecta) from the lower Cretaceous of the Liupanshan basin, Western China

Chen

et al. 2015

J. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…The position of this carbonate unit directly above a conglomerate suggests a cutoff or displacement of clastic material to the area and may have been related to synsedimentary faulting (Pedone & Caceres, 2002) or to relative changes in the clastic source, perhaps resulting from lake transgression (cf. Talbot, 1994;Leggitt & Cushman, 2001).…”

Section: Phytoherm Depositsmentioning

confidence: 99%

Petrographic and trace element analysis of uranium‐rich tufa calcite, middle Miocene Barstow Formation, California, USA

et al. 2004

View full text Add to dashboard Cite

An integrated petrographic and spectroscopic (X‐ray diffraction, phosphor imaging and synchrotron X‐ray absorption spectroscopy) study of tufas from the Miocene Barstow Formation, California, relates sample morphology, mineralogy and geochemical composition. The tufas, composed mainly of calcite that formed at the interface between an ancient alkaline lake and ground or spring waters, have textures similar to those of microbially mediated terrestrial stromatolites and travertines. The tufas have elevated concentrations of a number of trace elements including Mn, Fe, Sr and U. Synchrotron X‐ray fluorescence analyses show that U concentrations can exceed 500 p.p.m. X‐ray absorption spectroscopy indicates that the U in these samples is incorporated as U(IV). It is suggested here that alkaline lake waters had a high U/Ca ratio and tufa calcite formed where groundwater or (possibly epithermal) springs brought in Ca and trace elements such as Sr. The rapid, and possibly microbially mediated, precipitation of calcite allowed for incorporation of high concentrations of trace metals as either structural substitutes or extremely fine‐scale inclusions.

show abstract

“…A second ancient example of layered caddisfly‐dominated microbial‐carbonate mound formed in nearshore areas associated with Eocene Lake Gosiute during deposition of the ‘Laney Member’ (Leggitt & Cushman, 2001). Although several authors (Bradley, 1924; Roehler, 1991; Leggitt & Cushman, 2001; Leggitt & Loewen, 2002) have assigned these mounds to the Laney Member, unpublished data (V. L. Leggitt) indicate that these mounds may actually occur in the upper Wilkins Peak Member (Middle Eocene) of the Green River Formation. The mounds are especially well developed near the town of La Barge, Wyoming.…”

Section: Introductionmentioning

confidence: 99%

Palaeoenvironments associated with caddisfly‐dominated microbial‐carbonate mounds from the Tipton Shale Member of the Green River Formation: Eocene Lake Gosiute

2007

View full text Add to dashboard Cite

Caddisfly-dominated microbial-carbonate mounds and avian eggshell fragments are common in a nearshore, oolite facies of the Tipton Shale Member of the Eocene Green River Formation. The fossils occur in a 9 m thick carbonate sequence exposed on the south-west flank of Essex Mountain, Sweetwater County, Wyoming. The eggshell was determined to be of avian origin by examination of the radial eggshell microstructure by scanning electron microscopy and polarized light microscopy. Common allochems in the limestone include: ooids, pisoids, oncoids, ostracods, gastropods, intraclasts, caddisfly larval/pupal cases, fish bones, avian bones and avian eggshell fragments. Carbonate mineralogy varies between 95% calcite and 95% dolomite. Oxygen stable isotopes vary between )10AE1 and )1AE3& (V-PDB). Carbon and oxygen stable isotopes co-vary. Co-variance of oxygen and carbon stable isotopes indicates that Lake Gosiute was hydrologically closed during the formation of this oolite sequence. Positive excursions of oxygen stable isotope values are correlated with dolomite, caddisfly cases and avian eggshell fragments. These factors are probably associated with lake regression and more saline conditions. Negative excursions of oxygen stable isotope values are correlated with calcite, gastropods and intraclasts. These factors are probably associated with lake transgression and lake freshening. In the 9 m oolite sequence studied there are at least two inferred transgressions, three regressions and two storm events. The caddisfly cases and avian eggshell fragments occur in sediments formed only during low-stands of the lake as determined by other lake level proxies (dolomites and more positive oxygen stable isotope values). As avian eggshell fragments were formed under subaerial conditions, the avian eggshell fragments independently confirm lake regression. In addition, the occurrence of avian eggshell fragments during saline phases of the lake may indicate that the birds which produced the eggshell preferred saline conditions (or that their food preferred saline lake water).

show abstract

Complex caddisfly-dominated bioherms from the Eocene Green River Formation

Cited by 44 publications

References 6 publications

Exceptionally preserved caddisfly larval cases (Insecta) from the lower Cretaceous of the Liupanshan basin, Western China

Exceptionally preserved caddisfly larval cases (Insecta) from the lower Cretaceous of the Liupanshan basin, Western China

Petrographic and trace element analysis of uranium‐rich tufa calcite, middle Miocene Barstow Formation, California, USA

Palaeoenvironments associated with caddisfly‐dominated microbial‐carbonate mounds from the Tipton Shale Member of the Green River Formation: Eocene Lake Gosiute

Contact Info

Product

Resources

About