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Megerlia truncata

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Journal Article
Published: 01 August 2009
European Journal of Mineralogy (2009) 21 (4): 715–723.
... matrix. Here we report our observation by transmission electron microscopy (TEM) of a large compartment filled with amorphous calcium carbonate (ACC) in the shell of the modern brachiopod Megerlia truncata . The compartment has the typical shape and size of fibrous calcite crystals composing...
FIGURES | View All (9)
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Typical SEM images of the shell microstructure of  <span class="search-highlight">Megerlia</span> <span class="search-highlight">truncata</span>  obtai...
Published: 01 May 2007
F igure 1. Typical SEM images of the shell microstructure of Megerlia truncata obtained in forward scattering with a 70° inclined sample. The gray-scale contrasts reflect differences in orientation. Images ( a ) and ( b ) show the outer part of the ventral valve with primary layer (pl
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Cathodoluminescence image of the modern shell of  <span class="search-highlight">Megerlia</span> <span class="search-highlight">truncata</span> . Note ...
Published: 01 May 2007
F igure 9. Cathodoluminescence image of the modern shell of Megerlia truncata . Note the red luminescent layer at the inside of the shell, distinguishing a non-luminescent outer secondary layer and a luminescent inner secondary layer. The luminescent band widens at the skeletal parts
Journal Article
Published: 01 May 2007
American Mineralogist (2007) 92 (5-6): 722–734.
...F igure 1. Typical SEM images of the shell microstructure of Megerlia truncata obtained in forward scattering with a 70° inclined sample. The gray-scale contrasts reflect differences in orientation. Images ( a ) and ( b ) show the outer part of the ventral valve with primary layer (pl...
FIGURES | View All (11)
Journal Article
Published: 01 July 2004
European Journal of Mineralogy (2004) 16 (4): 693–697.
...Wolfgang W. SCHMAHL; Erika GRIESSHABER; Rolf NEUSER; Anette LENZE; Reinhart JOB; Uwe BRAND Abstract We investigated the ultrastructure of the secondary layer of the calcite shell of the terebratulide brachiopod Megerlia truncata with SEM and electron beam backscattering diffraction. The material...
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Journal Article
Published: 01 January 1960
Bulletin de la Société Géologique de France (1960) S7-II (2): 152–155.
...Graham F. Elliott Abstract Describes three Tertiary brachiopods from the Middle East--Streptaria arabica n.sp. from the Eocene of Arabia, Argyrotheca zenobiae n.sp. from the Miocene of Syria, and Megerlia truncata from the Pliocene of Syria. Their distribution and affinities are briefly discussed...
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Examples for location and shape of Vickers microhardness indents in the hin...
Published: 01 May 2007
F igure 7. Examples for location and shape of Vickers microhardness indents in the hinge (posterior) and commisure (anterior) parts of the shell of Megerlia truncata . The indents were imaged with an interference microscope ( Lohkämper et al. 2003 ). The scale bar in the images of the indents
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Large Vickers hardness indentations are shown in a cross-section of the cal...
Published: 01 April 2008
F ig . 6. Large Vickers hardness indentations are shown in a cross-section of the calcitic shell of Megerlia truncata. The indentations were made with a load of 50 ponds and a holding time of 10 s. Indents with the same load on the (104) plane of calcite give values of 136±5 HV 0.05/10
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Nano-indentation maps of ( a )  Lingula anatina ; ( b )  Discradisca stella...
Published: 01 April 2008
F ig . 9. Nano-indentation maps of ( a ) Lingula anatina ; ( b ) Discradisca stella ; and ( c ) Megerlia truncata displaying the nanohardness in GPa. The laminated structures of the chitinophosphatic shells of Lingula anatina and Discradisca stella have varying proportions of hard
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TEM images of FIB-prepared samples of fibres from the secondary layer of  M...
Published: 01 April 2008
F ig . 2. TEM images of FIB-prepared samples of fibres from the secondary layer of Megerlia truncata . Image contrasts are dominated by bend contours. ( a ) Shows a micrograph covering several cross-sectioned fibres as well as the intercrystalline organic film between the fibres (indicated
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Scanning electron micrograph of a portion of the secondary layer of the she...
Published: 01 July 2004
Fig. 2. Scanning electron micrograph of a portion of the secondary layer of the shell of Megerlia truncata with well exposed longitudinal sections of calcite crystal fibres. Euler angles of the crystal lattice orientation with respect to the sample coordinate system are given for various points
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SEM image showing orientation contrasts of a shell section of  <span class="search-highlight">Megerlia</span> tru...
Published: 01 April 2008
F ig . 3. SEM image showing orientation contrasts of a shell section of Megerlia truncata together with an EBSD map taken from a rectangular area marked in red on the SEM image. The EBSD map is given in RGB colours, which represent the three orientational Euler angles. The images at the bottom
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Vickers microhardness indents along a cross-section of the calcitic shell o...
Published: 01 April 2008
F ig . 7. Vickers microhardness indents along a cross-section of the calcitic shell of Megerlia truncata . The HV 0.005/10 microhardness values are plotted as a function of the fractional distance from the outer margin of the shell. Indents made into individual fibres in transverse cross
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Vickers microhardness values at various points of the shell in comparison t...
Published: 01 May 2007
layer can be seen in Figure 9 . ( a ) Data for Megerlia truncata ; ( b ) data for Terebratalia transversa .
Journal Article
Published: 01 April 2008
Mineralogical Magazine (2008) 72 (2): 541–562.
...F ig . 6. Large Vickers hardness indentations are shown in a cross-section of the calcitic shell of Megerlia truncata. The indentations were made with a load of 50 ponds and a holding time of 10 s. Indents with the same load on the (104) plane of calcite give values of 136±5 HV 0.05/10...
FIGURES | View All (12)
Journal Article
Published: 01 April 2009
European Journal of Mineralogy (2009) 21 (2): 303–315.
... & Fallick, 2002 ; Auclair et al. , 2003 ; Brand et al. , 2003 ; Weiner & Dove, 2003 , Parkinson et al. , 2005 ). Our previous work on the microstructure and the texture of specimens of the recent terebratulid brachiopod species Megerlia truncata and Terebratalia transversa revealed...
FIGURES | View All (12)
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Top: Scanning electron micrograph of the fibrous secondary layer of the she...
Published: 01 July 2004
Fig. 1. Top: Scanning electron micrograph of the fibrous secondary layer of the shell of Megerlia truncata. Bottom: Outline of the examined cross section through the mirror plane of the shell and pole figures as determined by an EBSD scan of 5 μm step width covering the outlined rectangle
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Hierarchical fibre-composite microstructure of the shell of the calcitic br...
Published: 01 April 2008
F ig . 1. Hierarchical fibre-composite microstructure of the shell of the calcitic brachiopod Megerlia truncata. The SEM images are arranged in a series of increasing magnification. Images ( a ), ( b ) and ( f ) are polished cross-sections taken in foreward scattering mode with a 70° inclined
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Geological section of Hgaf Tamda (Dahra). − Lithostratigraphic succession. ...
Published: 08 January 2024
of coralliferous white marly limestone. b2: Coral facies (coral colony). b3: Facies of solitary corals in marly limestone. b4: Ostreid shell concentrations. b5: Megerlia truncata ( Mt ) concentration. c: View showing in the lower left : Messinian-Zanclean boundary (green marls − coralliferous white marly
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Pole-density plots obtained from EBSD scans at various points in the examin...
Published: 01 May 2007
F igure 5. Pole-density plots obtained from EBSD scans at various points in the examined cross section of the shell of Megerlia truncata . The cross section was taken approximately through the median plane of the shell, cutting through the tooth (marked T) at the posterior side of the shell