First Early Cretaceous mammal from the eastern seaboard of the United States

Cifelli, Richard L.; Lipka, Thomas R.; Schaff, Charles R.; Rowe, Timothy

doi:10.1080/02724634.1999.10011134

Cited by 31 publications

(21 citation statements)

References 17 publications

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“…The presence of masseteric foramina at the anterior margin of the masseteric fossa has been recognised in Meiconodon, some other taxa of triconodontids and a number of peramurans and early tribosphenidans, but this feature is lacking in stem mammaliaform taxa such as Kuehneotherium and Morganucodon (Kielan-Jaworowska and Dashzeveg 1989;Rougier et al 1998; Davis 2012). Despite the significant depth of the dentary, the root relative to the mesiodistal length in FPDM-V9172 is significantly shorter compared to the roots of cheek teeth in Gobiconodon (KielanJaworowska and Dashzeveg 1998) and alticonodontine triconodontids, Arundelconodon and Corviconodon (Cifelli and Madsen 1998;Cifelli et al 1999).…”

Section: Comparison and Discussion Of Fpdm-v9172mentioning

confidence: 91%

“…Although FPDM-V9172 lacks a large part of the crown morphology, the small cusp d on the m4 in FPDM-V9172 does not show an interlocking structure unlike those in alticonodontines. Compared with the CT images of the lower molars of the alticonodontine Arundelconodon figured by Cifelli et al (1999), the mesial root of the m4 in FPDM-V9172 also shows a similar structure in horizontal cross section (a half-moon shape with a mesial concavity), but its mesial surface is less excavated than in Arundelconodon ( Figure 5 (I)); if the interlocking mechanism of FPDM-V9172 is somewhat developed between lower molars, it is not comparable to those of alticonodontines.…”

Section: Hirasawamentioning

confidence: 99%

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New mammalian specimens from the Lower Cretaceous Kitadani Formation, Tetori Group, Fukui, Japan

Azuma

Shibata

2015

Historical Biology

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Section: Comparison and Discussion Of Fpdm-v9172mentioning

confidence: 91%

Section: Hirasawamentioning

confidence: 99%

New mammalian specimens from the Lower Cretaceous Kitadani Formation, Tetori Group, Fukui, Japan

Azuma

Shibata

2015

Historical Biology

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“…Specimen courtesy of the Smithsonian Institution, National Museum of Natural History. Reprinted from Cifelli et al (1999), with permission. distinctive marsupial reproductive patterns.…”

Section: Mammalian Origins: the Middle Earmentioning

confidence: 96%

“…Reprinted from Rowe (1996b), with permission. (b) A sample CT slice, demonstrating that this specimen retains the primitive condition of non-interlocked tooth roots (Cifelli et al 1999). Specimen courtesy of the Smithsonian Institution, National Museum of Natural History.…”

Section: Mammalian Origins: the Middle Earmentioning

confidence: 99%

Applications of high-resolution X-ray computed tomography in petrology, meteoritics and palaeontology

Carlson

Rowe

Ketcham

et al. 2003

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High-resolution and ultra-high-resolution X-ray computed tomography are rapid, non-destructive and extremely powerful techniques for three-dimensional examination and measurement of a great variety of geological materials and specimens with sizes from several millimetres to several decimetres. A review of recent applications in petrology, meteoritics and palaeontology, which utilized an instrument optimized for geological studies (HighResolution X-ray Computed Tomography Facility of the University of Texas at Austin), documents an abundance of novel scientific results and illuminates the potential for still broader application of these techniques in the earth sciences.Many earth science investigations require examination or measurement of the internal features of specimens in three dimensions, tasks to which X-ray computed tomography (CT) is well-suited. A variety of different X-ray CT instruments and techniques are available. The scale of the object to be studied and the spatial resolution required in the images commonly dictate which is employed (Table 1). High-resolution X-ray CT (HRXCT) and ultra-high-resolution X-ray CT (UHRXCT) are techniques suitable for studying objects with dimensions from a few millimetres to a few decimetres. Into this range of scales falls a wide variety of intriguing geological problems. This paper provides a selective review of recent HRXCT and UHRXCT work done at the University of Texas at Austin, in the form of very brief synopses of individual projects with references to the published literature for more complete exposition. Our purpose is to stimulate further exploitation of these techniques in the earth sciences by providing an overview of the broad range of geological questions that can be productively addressed using this rapid, non-destructive, visually powerful and fully digital tool.

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“…X-ray computed tomography (CT) has long demonstrated its potential as a non-destructive analysis and visualisation method in geoscience, with applications extending from palaeontology, to soil research, oil and gas production, among others [1][2][3]. X-ray CT has been complemented by neutron radiography and neutron tomography, expanding the range of applications to e.g., the study of denser materials and larger samples volumes, and to samples with light elements dispersed in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Investigation of a Monturaqui Impactite by Means of Bi-Modal X-ray and Neutron Tomography

et al. 2018

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X-ray and neutron tomography are applied as a bi-modal approach for the 3D characterisation of a Monturaqui impactite formed by shock metamorphism during the impact of an iron meteorite with the target rocks in the Monturaqui crater (Chile). The particular impactite exhibits structural heterogeneities on many length scales: its composition is dominated by silicate-based glassy and crystalline materials with voids and Fe/Ni-metal and oxihydroxides particles generally smaller than 1 mm in diameter. The non-destructive investigation allowed us to apply a novel bi-modal imaging approach that provides a more detailed and quantitative understanding of the structural and chemical composition compared to standard single mode imaging methods, as X-ray and neutron interaction with matter results in different attenuation coefficients with a non-linear relation. The X-ray and neutron data sets have been registered, and used for material segmentation, porosity and metallic content characterization. The bimodal data enabled the segmentation of a large number of different materials, their morphology as well as distribution in the specimen including the quantification of volume fractions. The 3D data revealed an evaporite type of material in the impactite not noticed in previous studies. The present study is exemplary in demonstrating the potential for non-destructive characterisation of key features of complex multi-phase objects such as impactites.

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First Early Cretaceous mammal from the eastern seaboard of the United States

Cited by 31 publications

References 17 publications

New mammalian specimens from the Lower Cretaceous Kitadani Formation, Tetori Group, Fukui, Japan

New mammalian specimens from the Lower Cretaceous Kitadani Formation, Tetori Group, Fukui, Japan

Applications of high-resolution X-ray computed tomography in petrology, meteoritics and palaeontology

Investigation of a Monturaqui Impactite by Means of Bi-Modal X-ray and Neutron Tomography

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