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![Stratigraphic logs of the San Lorenzo and Fuentepizarra formations studied in this work; incised basement not to scale; Fp – Fuentepizarra Formation; for geographic setting, see Figures 1b and 2.]()
![Geological map of the eastern edge of the Alcudia anticline showing the unconformities that mark the Ibor Group/San Lorenzo Formation contact and the base of the Lower Ordovician Purple Series and Armorican Quartzite formations; updated from Ortega Girones et al. (1988), Lillo Ramos et al. (1998), Pieren & García-Hidalgo (1999) and Pieren Pidal (2009); abbreviations: Fr – Fresneda river creek (38° 31′ 6″ N; 3° 53′ 44″ W); G – La Gitana mining area (38°35′ 2″ N; 4° 1′ 27″ W); Ga – Gargantilla stream (38° 29′ 51″ N; 3° 52′ 56″ W); st – stratotype of the San Lorenzo Formation (38° 27′ 57″ N, 3° 48′ 3″ W); * – stratotype of Fuentepizarra Formation; Fortu – Fortunian Stage; St. 2 – Cambrian Stage 2.]()
![Facies and geometrical relationships of the San Lorenzo Formation. (a) Angular discordance separating the greywackes of the Lower Alcudian – Domo Extremeño Supergroup (left) from the overlying Fuentepizarra Formation; Fresneda river creek, Alcudia anticline. (b) Complete shoaling cycle from shales grading upsection into sandstone, pebbly sandstone and conglomerate from the San Lorenzo Formation at Gargantilla stream, Alcudia anticline. (c) Shale/sandstone alternations exhibiting thickening-upward cycles, up to 14 cm thick; Castañar de Ibor, Ibor anticline. (d) Pinkish conglomerate-to-pebbly sandstones with fining-upward trends from the San Lorenzo Formation at the stratotype. (e) Photomicrograph of a conglomerate with litharenitic matrix rich in polyphase clasts including vein quartz and ironstone subunits and mafic volcaniclasts from the San Lorenzo Formation at La Calera log. (f) Photomicrograph of a sandy channel scouring a massive iron oxyhydroxide groundmass from the base of the San Lorenzo Formation at Gargantilla stream; scale bars = 2 mm; abbreviations: co – conglomerate; ir – ironstone; ma – mafic volcaniclast; s – sandstone; sh – shale. Length of hammer for scale is 32 cm. Length of pen for scale is 13 cm.]()
![Field aspect and thin-section photomicrographs of the Anabarella-bearing phosphoritic and phosphatic limestone interbeds from the Fuentepizarra Formation in the eastern edge of the Alcudia anticline. (a) Two brownish phosphoritic interbeds in a monotonous greenish shaly succession. Length of hammer head for scale is 5 cm (b) Distal tempestite, about 1 cm thick, composed of imbricated, sub-rounded phosphatic clasts encased in a silty matrix. (c) Phosphatic limestone bed with two angular clasts composed of phosphatic crusts. (d) Packstone rich in Anabarella helicoidal shells (partly phosphatized) with intraparticulate and shelter porosity occluded with partly silicified drusy calcite cements; cements used as polarity criteria allows interpretation of polyphase clasts. (e) Detail of an Anabarella microfossil highlighting the partial silicification (si) of a phosphatic (fr) shell and the final infill of cracks by iron oxyhydroxides (Fe). (f) Detail of another Anabarella shell displaying the setting of dolomite (do) rhombs unaffected by silicification. Abbreviation: ca – calcite.]()
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1-8 OF 8 RESULTS FOR
Fuentepizarra Formation
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Journal Article
Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain Available to Purchase
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 11 May 2021
Geological Magazine (2022) 159 (7): 1251–1261.
... – lower Terreneuvian Ibor Group from the overlying Terreneuvian San Lorenzo and Fuentepizarra formations. The sedimentation of the San Lorenzo Formation reflects two palaeogeographic scenarios: (i) a low-angle stable basement recording shoaling-upward siliciclastic cycles, and (ii) perturbations...
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Stratigraphic logs of the San Lorenzo and Fuentepizarra formations studied ... Available to Purchase
in Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain
> Geological Magazine
Published: 11 May 2021
Fig. 4. Stratigraphic logs of the San Lorenzo and Fuentepizarra formations studied in this work; incised basement not to scale; Fp – Fuentepizarra Formation; for geographic setting, see Figures 1 b and 2 .
Image
Geological map of the eastern edge of the Alcudia anticline showing the unc... Available to Purchase
in Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain
> Geological Magazine
Published: 11 May 2021
Formation (38° 27′ 57″ N, 3° 48′ 3″ W); * – stratotype of Fuentepizarra Formation; Fortu – Fortunian Stage; St. 2 – Cambrian Stage 2.
Image
Facies and geometrical relationships of the San Lorenzo Formation. (a) Angu... Available to Purchase
in Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain
> Geological Magazine
Published: 11 May 2021
Fig. 5. Facies and geometrical relationships of the San Lorenzo Formation. (a) Angular discordance separating the greywackes of the Lower Alcudian – Domo Extremeño Supergroup (left) from the overlying Fuentepizarra Formation; Fresneda river creek, Alcudia anticline. (b) Complete shoaling cycle
Image
Field aspect and thin-section photomicrographs of the Anabarella -bearing ... Available to Purchase
in Cadomian orogenic collapse in the Ibor and Alcudia anticlines of the Central Iberian Zone, Spain
> Geological Magazine
Published: 11 May 2021
Fig. 6. Field aspect and thin-section photomicrographs of the Anabarella -bearing phosphoritic and phosphatic limestone interbeds from the Fuentepizarra Formation in the eastern edge of the Alcudia anticline. (a) Two brownish phosphoritic interbeds in a monotonous greenish shaly succession
Journal Article
Geology and palaeontology of the Codos anticline, eastern Iberian Chains, NE Spain: age constraints for the Ediacaran–Cambrian boundary in the Iberian Chains Open Access
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 23 July 2021
Geological Magazine (2022) 159 (7): 1240–1250.
... and the middle Fuentepizarra Formation (see also Álvaro et al. 2019 , fig. 16). Accordingly, a roughly coeval age is assumed for the three fossiliferous stratigraphic levels. However, the limited biostratigraphic value of the known fossil remains does not allow a precise correlation. The purported anabaritids...
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Journal Article
Ordovician tectonics and crustal evolution at the Gondwana margin (Central Iberian Zone) Available to Purchase
Journal: Journal of the Geological Society
Publisher: Geological Society of London
Published: 04 August 2022
Journal of the Geological Society (2022) 179 (5): jgs2021-168.
... unconformity ( Álvaro and Lorenzo 2021 ) ( Fig. 2 ). This formation consists of conglomerate and sandstone beds and channels overlain by sandstone and shale beds passing upwards to shales (Fuentepizarra Formation) with phosphatic carbonate interbeds, reflecting a drastic change from slope-related deposits...
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Journal Article
Revisiting the phosphorite deposit of Fontanarejo (central Spain): new window into the early Cambrian evolution of sponges and the microbial origin of phosphorites Open Access
Journal: Geological Magazine
Publisher: Cambridge University Press
Published: 29 September 2021
Geological Magazine (2022) 159 (7): 1220–1239.
... in stratigraphically equivalent sedimentary rocks from the Alcudia anticline close to Ciudad Real in central Spain (i.e. ‘Conglomerados de San Lorenzo’, Pusa or Fuentepizarra formations: Pieren & García-Hidalgo, 1999 ; Vidal et al. 1999 ; Pieren Pidal, 2000 ; Álvaro et al. 2019 ; Álvaro & Lorenzo, 2021...
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