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Yudachica Member

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Journal Article
Published: 01 November 2007
Geological Magazine (2007) 144 (6): 909–936.
... Yudachica Member (new). The Yudachica nonconformably overlies middle Proterozoic basement as a result of very high late Late Cambrian eustatic levels. The Yudachica changes from storm-dominated, but slightly dysoxic, shelf facies (fossil hash limestone and shale) in the south to an upper slope facies...
FIGURES | View All (11)
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Figure 13.  Tapuritreta reclinata  n. sp. from the lower <b>Yudachica</b> <b>Member</b> (...
Published: 01 January 2011
Figure 13. Tapuritreta reclinata n. sp. from the lower Yudachica Member (sample Tu-5.7), ventral valves. 1, 2 , valve in posterior and lateral view (holotype, NYSM17992); 3 , oblique posterior view of broken valve (NYSM17993); 4 , interior of 1 (holotype); 5 , interior with short ridge-like
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Figure 14.  Tapuritreta reclinata  n. sp. from the lower <b>Yudachica</b> <b>Member</b> (...
Published: 01 January 2011
Figure 14. Tapuritreta reclinata n. sp. from the lower Yudachica Member (sample Tu-5.7), dorsal valves. 1–5 , various interior views of adult ( 1–3 ) to juvenile valves ( 4, 5 ) (NYSM17996, NYSM17997, NYSM17998, NYSM17999, NYSM18000); 6, 7 , dorsal exteriors (NYSM18001, NYSM18002); 8
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Figure 15.  Tapuritreta reclinata  n. sp. from the lower <b>Yudachica</b> <b>Member</b> (...
Published: 01 January 2011
Figure 15. Tapuritreta reclinata n. sp. from the lower Yudachica Member (sample Tu-5.7). 1–3 , dorsal pseudointerarea, cardinal muscle scars, and median buttresses of three specimens (NYSM17998, NYSM17996, NYSM18006); 4, 5 , larval shell and transition between larval and postlarval shell in two
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Figure 16. Acrotretidae n. gen. n. sp. from the basal <b>Yudachica</b> <b>Member</b>.  1,...
Published: 01 January 2011
Figure 16. Acrotretidae n. gen. n. sp. from the basal Yudachica Member. 1, 2 , interior and posterior view of ventral valve (NYSM18010); 3 , dorsal valve interior (NYSM18011); 4 , 5 , ventral valve with prominent apical process in posterodorsal and interior view (NYSM18012); 6 , oblique view
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Figure 17.  Ottenbyella ? spp. from <b>Yudachica</b> <b>Member</b> ( 4–6 , sample Tu-9.8)...
Published: 01 January 2011
Figure 17. Ottenbyella ? spp. from Yudachica Member ( 4–6 , sample Tu-9.8) and Río Salinas Member ( 1–3 , sample Tu-35.7). 1 , corroded ventral valve of Ottenbyella ? sp. B in lateral view (NYSM18015); 2, 3 , ventral valve of Ottenbyella ? sp. B in apical and lateral view (NYSM18016); 4–6
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Figure 20.  Eoscaphelasma ? sp. (NYSM18021) from the basal <b>Yudachica</b> <b>Member</b>...
Published: 01 January 2011
Figure 20. Eoscaphelasma ? sp. (NYSM18021) from the basal Yudachica Member (sample Tu-2.05). 1 , dorsal valve in ventral view showing straight posterior margin and prominent concentric fila; 2 , larval shell with flat based pits; 3 , detail of larval shell showing pits of two size categories
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Sections in the lower Tiñu Formation (<b>Yudachica</b> <b>Member</b>); conodont samples ...
Published: 01 November 2007
Figure 2. Sections in the lower Tiñu Formation (Yudachica Member); conodont samples (SIx and Tu) indicated to right of columns; number after locality abbreviation is metres above Oaxaca Complex. Figure shows proposed depositional sequences of Yudachica Member.
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Upper Cambrian  Cordylodus  species from the <b>Yudachica</b> <b>Member</b> of the Tiñu ...
Published: 01 November 2007
Figure 5. Upper Cambrian Cordylodus species from the Yudachica Member of the Tiñu Formation; hypotype specimens. (a–g) Cordylodus andresi Viira & Sergeeva in Kaljo et al. 1986 , from Tu-4.95 unless otherwise indicated. (a) Rounded element, NYSM 17369, ×202; (b) rounded element, NYSM
Journal Article
Published: 01 November 2013
Journal of Paleontology (2013) 87 (6): 984–990.
...Paul D. Taylor; Björn Berning; Mark A. Wilson A bstract Pywackia baileyi Landing in Landing et al., 2010 , from the upper Cambrian Yudachica Member of Oaxaca State, southern Mexico, consists of small, phosphatic, proximally tapering cylindrical rods covered by shallow polygonal calices...
FIGURES | View All (5)
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Figure 22.  Oaxaquiatreta labrifera  n. gen. and n. sp. from the <b>Yudachica</b> ...
Published: 01 January 2011
Figure 22. Oaxaquiatreta labrifera n. gen. and n. sp. from the Yudachica Member. 1 , pedicle opening of NYSM18025; 2 , ventral apical area with larval shell and posteriorly sealed pedicle opening (NYSM18034); 3 , apical area of NYSM18030 (holotype); 4 , dorsal larval shell of NYSM18032
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Figure 21.  Oaxaquiatreta labrifera  n. gen. and n. sp. from the <b>Yudachica</b> ...
Published: 01 January 2011
Figure 21. Oaxaquiatreta labrifera n. gen. and n. sp. from the Yudachica Member. 1 , ventral exterior (NYSM18022); 2 , ventral exterior with short collar-like external pedicle tube (NYSM18023); 3, 4 , ventral valve in dorsal and lateral view (NYSM18024); 5 , ventral exterior (NYSM18025); 6
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Upper Cambrian conodonts with coniform apparatuses from the <b>Yudachica</b> Membe...
Published: 01 November 2007
Figure 6. Upper Cambrian conodonts with coniform apparatuses from the Yudachica Member of the Tiñu Formation; hypotype specimens unless otherwise indicated. (a–h) Orminskia rexroadae Landing gen. et sp. nov. (a) Holoytpe NYSM 17390, ×108, locality Tu-2.05 (see Fig. 10a ); (b) paratype NYSM
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Figure 19.  1–3 , Acrotretidae gen. and sp. indet. B (NYSM18019) from the Y...
Published: 01 January 2011
Figure 19. 1–3 , Acrotretidae gen. and sp. indet. B (NYSM18019) from the Yudachica Member (sample Tu-8.5); ventral valve in oblique lateral, posterodorsal, and posterior view; 4, 5 , Acrotretidae gen. and sp. indet. C (NYSM18020) from the Yudachica Member (sample Tu-9.8), interior of ventral
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Conodont-based correlation of the Tiñu Formation into conodont and trilobi...
Published: 01 November 2007
(e.g. Miller, 1980 ). Figure shows proposed depositional sequences of Yudachica Member.
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Back-scattered scanning electron micrographs of the putative bryozoan  Pywa...
Published: 01 November 2013
Figure 1 Back-scattered scanning electron micrographs of the putative bryozoan Pywackia baileyi from the upper Cambrian Yudachica Member of Oaxaca State, Mexico, NYSM Tu-2.05. 1 , well preserved rod tapering towards the proximal end, cell 36, ×31; 2 , unusual curved rod, cell 29, ×47; 3
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Back-scattered scanning electron micrographs illustrating the resemblance b...
Published: 01 November 2013
Figure 4 Back-scattered scanning electron micrographs illustrating the resemblance between the Cambrian Pywackia baileyi and the axis of the Recent pennatulacean octocoral Lituaria sp. 1 , Pywackia baileyi , upper Cambrian, Yudachica Member, Oaxaca State, Mexico, NYSM Tu-2.05, cell 36
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Figure 7.  Eurytreta  cf.  fillmorensis  Holmer, Popov, Streng and Miller, ...
Published: 01 January 2011
Figure 7. Eurytreta cf. fillmorensis Holmer, Popov, Streng and Miller, 2005 , from the upper Yudachica Member. 1–4 , Pseudointerarea and median buttress of four dorsal valves (NYSM17946, NYSM17947, NYSM17949, NYSM17948); 5 , columnar shell structure of 1 ; 6, 7 , two dorsal larval shells
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Figure 18. Acrotretidae gen. and sp. indet. A (NYSM18018) from the Yudachic...
Published: 01 January 2011
Figure 18. Acrotretidae gen. and sp. indet. A (NYSM18018) from the Yudachica Member (sample Tu-5.7). 1–3 , ventral valve in ventral, anterior, and oblique lateral view; 4–6 , details of columnar to septate shell structure. Scale bar equals 500 µm for 1–3 ; 50 µm for 4 and 6 ; 25 µm for 5 .
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Stratigraphic distribution of  Pywackia baileyi  (indicated by X). Table
  ...
Published: 01 March 2015
sclerites, and originally phosphatic (proto- and euconodonts) remains. Samples from upper Cambrian Cordylodus andresi Zone, lower Tiñu Formation, lower Yudachica Member, Río Salinas section, Oaxaca State, southern Mexico. Number after hyphen (i.e., -1.9, -2.0, -4.3, -4.95) is meters