139:
372:
546:
Formation. The outcropping thickness of the unit is 25 m (82 ft). Dark brown friable mudstones crop out above the northern shore of the reservoir, with remaining molluscs in the lower part, near the shore. In the upper section, there are ochre mudrocks which are gypseous, and its outcrops are partially covered; there, its thickness is 20 m (66 ft). In this sector, the Jagüel
Formation is covered unconformably by the
379:
526:(Jagüel de Rosauer) and at Lomas Coloradas, where the unit is 18–26 m thick (59–85 ft). The outcrops around Pellegrini Lake keep the typical characteristics of the unit. Olive green calcareous mudrocks appear in the northern sector of the lake, which are solid and friable with fragmentary remains of
545:
Finally, the lower part of the Jagüel
Formation crops out above the southern margin of Casa de Piedra reservoir. It is composed of brown–ochre mudrocks, with many veins of gypsum at the base, and a thin layer of highly fossiliferous limestones that lies 1 m (3 ft) above its contact with the Allen
541:
In the hills located in the north of
General Roca (type locality of the Roca Formation), the outcrops of the Jagüel Formation are very friable, and they are covered by rock fragments from upper layers of the same unit. They are brown–olive. They make up the base of the hills and have the typical
702:
The Jagüel
Formation contains marine deposits accumulated in inner positions of the basin, with depths that vary from a mid to an outer continental shelf. Sedimentological and paleontological evidence suggests a predominance of normal atmospheric conditions, below the normal wave base and with
519:), traversed by thin veins of fibrous gypsum. These veins are found on the meteorized surface and they give distinct brightness to the outcrops. The claystones are plastic and friable, with waxy brightness. Some of them are laminated, while the siltstones are grayish.
588:
The Jagüel
Formation, aged Maastrichtian and Danian, constitutes the peak of the transgression within the Malargüe Group, reaching maximum depths of a mid–outer shelf environment. It has abundant marine microfossils, such as planktonic and benthic
570:
The micropaleontological content of the Jagüel
Formation made it possible to classify it as Maastrichtian–Danian (Early and Late). This formation conformably overlies the Allen Formation and it also conformably underlies the Roca Formation . The
138:
553:
In the area of
Huantraico, there are greenish calcareous mudstones, with thin intercalations of calcareous sandstones; the mudstones are solid or laminated. The lithofacies characteristics of the unit suggest an outer
436:" of the Allen Formation, and the base of the first organogenic limestone of the Roca Formation. The Jagüel Formation is particularly important since a vast area of the formation contains the
606:
445:
424:. Its name was coined by Windhausen in 1914. This unit, defined in the eastern area of the Neuquén Embayment, registers an event of marine flooding that happened during the ages
635:
As a result of a taxonomic revision of the
Cretaceous–Paleogene (K–Pg) boundary, oysters in the Neuquén Basin, in the west of Argentina, it was mentioned that there were
821:"High-resolution Hg chemostratigraphy: A contribution to the distinction of chemical fingerprints of the Deccan volcanism and Cretaceous–Paleogene Boundary impact event"
924:
934:
939:
919:
601:
Generally, they are well preserved. The micropaleontological record of the Jagüel
Formation is of paramount importance since this unit contains the
487:
Moreover, its outcrops are partially covered in the eastern flank of Añelo low (sector Lomas
Coloradas–sierras Blanca), in the surrounding area of
903:
538:. Besides, there is an important microfaunal assemblage from the mid–Maastrichtian. In this area, it has a maximum thickness of 30 m (98 ft).
371:
979:
602:
437:
870:"Las ostras del Límite Cretácico-Paleógeno de la Cuenca Neuquina (Argentina). Su importancia bioestratigráfica y paleobiogeográfica"
723:
Leanza, Héctor A. (1999). "The Jurassic and Cretaceous terrestrial beds from southern Neuquén Basin, Argentina (field guide)".
974:
964:
929:
969:
944:
221:
637:
267:
228:
954:
800:
Rodríguez, María Fernanda (2011). «El Grupo Malargüe (Cretácico Tardío-Paleógeno Temprano) en la Cuenca Neuquina».
492:
572:
959:
542:
aspect of this unit. The boundary with the overlying Roca Formation is marked by yellowish resistant limestones.
413:
176:
496:
667:
623:
547:
523:
775:(Boletín Nº 370). Servicio Geológico Minero Argentino - Instituto de Geología y Recursos Minerales: 32–35.
643:
476:, where the "Rocanense Sea" reached its maximum depth. In the Andean region, it crops out in the south of
949:
869:
660:
343:
302:
654:
832:
401:
156:
899:
481:
306:
650:
484:), the Jagüel Formation crops out at Cerro Villegas, where it is 23 metres (75 ft) thick.
776:
728:
555:
461:
421:
166:
144:
848:
840:
477:
473:
328:
310:
480:, where its fossil content dates back to the age Maastrichtian. In the area of Huantraico (
488:
417:
186:
836:
598:
453:
260:
727:. San Miguel de Tucumán: Instituto Superior de Correlación Geológica (INSUGEO): 7–27.
913:
768:
503:, its outcrops have few morphological features and they are often partially covered.
425:
90:
42:
38:
820:
590:
844:
535:
472:
The main outcrops of the Jagüel Formation are found in the inner sectors of the
65:
17:
683:
679:
457:
110:
75:
780:
767:
Rodríguez, María F.; Leanza, Héctor A.; Salvarredy Aranguren, Matías (2007).
732:
530:(oysters). In this sector, there is also abundant fossil content composed of
282:
269:
243:
230:
559:
500:
409:
405:
205:
201:
115:
59:
50:
448:. In this period of time, animal species became extinct, such as non–avian
691:
675:
618:
594:
527:
516:
449:
441:
209:
105:
100:
85:
80:
70:
575:
lies above these formations. All of them belong to the Malargüe Group.
687:
531:
512:
120:
95:
853:
511:
The Jagüel Formation consists of monotonous olive green and yellowish
647:
495:. Having reduced outcrops, it can be observed in the surroundings of
433:
429:
46:
874:
Ameghiniana (Revista de la Asociación Paoleontológica Argentina)
674:
Moreover, it was observed that there were other specimens, like
894:
703:
optimal circulation, away from the sources of detritus supply.
432:. It consists of mudrocks formed between the upper section or "
522:
With these distinct characteristics, it crops out in its
491:, in the hills to the north of Río Negro extending to
357:
349:
339:
334:
324:
316:
298:
259:
220:
215:
197:
192:
182:
172:
162:
152:
32:
825:Palaeogeography, Palaeoclimatology, Palaeoecology
900:International Chronostratigraphic Chart v2018/08
819:Sial, A.N.; Chen, Jiubin; Lacerda, L.D. (2014).
802:Relatorio del XVIII Congreso Geológico Argentino
617:The record of faunal marine reptiles include
8:
607:Cretaceous–Paleogene (K–Pg) extinction event
446:Cretaceous–Paleogene (K–Pg) extinction event
499:reservoir. Due to its fine and homogeneous
137:
29:
852:
605:in different localities, which marks the
895:International Commission on Stratigraphy
420:. All of these formations belong to the
378:
712:
762:
7:
925:Maastrichtian Stage of South America
814:
812:
810:
796:
794:
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790:
760:
758:
756:
754:
752:
750:
748:
746:
744:
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718:
716:
769:"Hoja Geológica 3969-II - Neuquén"
25:
940:Paleocene Series of South America
638:Pycnodonte (Phygraea) vesicularis
147:in Cañadón Cholino (General Roca)
27:Geological formation in Argentina
920:Geologic formations of Argentina
444:. It also shows evidence of the
377:
370:
558:environment, below the normal
1:
935:Cretaceous–Paleogene boundary
603:Cretaceous–Paleogene boundary
597:and nannofossils, as well as
438:Cretaceous–Paleogene boundary
845:10.1016/j.palaeo.2014.08.013
573:Pircala–El Carrizo Formation
386:Jagüel Formation (Argentina)
261:Approximate paleocoordinates
880:(4). Buenos Aires: 449–471.
996:
440:that marks the end of the
980:Paleontology in Argentina
904:Archive from 31 July 2018
515:(claystones, siltstones,
365:
136:
37:
868:Casadio, Silvio (1998).
698:Depositional environment
668:Gryphaeostrea callophyla
624:Euclastes meridionalis
621:and the marine turtle
548:Vaca Mahuida Formation
460:, and many groups of
975:Open marine deposits
965:Siltstone formations
930:Cretaceous Argentina
644:Amphidonte mendozana
566:Age and correlations
402:geological formation
157:Geological formation
970:Mudstone formations
945:Paleogene Argentina
837:2014PPP...414...98S
804:(Neuquén): 245-264.
412:. It underlies the
279: /
240: /
39:Stratigraphic range
661:Ambigostrea clarae
631:Macroinvertebrates
556:continental shelf
468:Area distribution
416:and overlies the
394:
393:
344:Jagüel de Rosauer
311:Mendoza Provinces
16:(Redirected from
987:
960:Shale formations
882:
881:
865:
859:
858:
856:
816:
805:
798:
785:
784:
764:
737:
736:
725:Serie Miscelánea
720:
655:Gyrostrea lingua
599:dinoflagellates.
398:Jagüel Formation
381:
380:
374:
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284:
280:
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272:
255:
254:
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62:
33:Jagüel Formation
30:
21:
18:Jaguel Formation
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988:
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766:
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709:
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615:
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489:Pellegrini Lake
470:
454:marine reptiles
418:Allen Formation
390:
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187:Allen Formation
148:
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28:
23:
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15:
12:
11:
5:
993:
991:
983:
982:
977:
972:
967:
962:
957:
955:Malargüe Group
952:
947:
942:
937:
932:
927:
922:
912:
911:
908:
907:
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889:External links
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579:Fossil content
577:
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508:
505:
497:Casa de Piedra
469:
466:
422:Malargüe Group
414:Roca Formation
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177:Roca Formation
174:
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167:Malargüe Group
164:
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145:Malargüe Group
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645:
640:
639:
630:
628:
626:
625:
620:
612:
610:
608:
604:
600:
596:
593:, calcareous
592:
583:
578:
576:
574:
565:
563:
561:
557:
551:
549:
543:
539:
537:
533:
529:
525:
524:type locality
520:
518:
514:
506:
504:
502:
498:
494:
490:
485:
483:
479:
475:
474:Neuquén Basin
467:
465:
463:
459:
455:
451:
447:
443:
439:
435:
431:
427:
426:Maastrichtian
423:
419:
415:
411:
407:
404:, located in
403:
399:
373:
364:
360:
356:
352:
348:
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330:
329:Neuquén Basin
327:
323:
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312:
308:
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301:
297:
292:
283:41.5°S 56.0°W
264:
262:
258:
253:
244:38.9°S 67.6°W
225:
223:
219:
214:
211:
207:
203:
200:
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117:
112:
107:
102:
97:
92:
87:
82:
77:
72:
67:
61:
52:
48:
44:
43:Maastrichtian
40:
36:
31:
19:
950:Danian Stage
877:
873:
863:
828:
824:
801:
772:
724:
701:
682:, irregular
673:
666:
659:
642:
636:
634:
622:
616:
591:foraminifera
587:
584:Microfossils
569:
552:
544:
540:
521:
510:
493:General Roca
486:
471:
462:microfossils
442:Mesozoic Era
397:
395:
358:Year defined
335:Type section
288:-41.5; -56.0
249:-38.9; -67.6
143:Outcrops of
536:brachiopods
452:, the last
286: /
247: /
222:Coordinates
58:68–63
914:Categories
854:11336/4970
831:: 98–115.
707:References
680:gastropods
534:and small
353:Windhausen
781:0328-2333
733:1514-4275
688:bryozoans
684:echinoids
651:wilckensi
619:mosasaurs
595:ostracods
560:wave base
517:mudstones
507:Lithology
501:lithology
458:ammonites
450:dinosaurs
410:Argentina
406:Patagonia
340:Named for
320:Argentina
303:Río Negro
206:siltstone
202:Claystone
193:Lithology
173:Underlies
51:Tiupampan
692:decapods
676:bivalves
613:Reptiles
532:scallops
528:molluscs
513:mudrocks
350:Named by
216:Location
210:mudstone
183:Overlies
833:Bibcode
773:Boletin
482:Neuquén
478:Mendoza
317:Country
307:Neuquén
274:56°00′W
271:41°30′S
235:67°36′W
232:38°54′S
198:Primary
163:Unit of
127:↓
779:
731:
690:, and
648:Ostrea
434:Gypsum
430:Danian
325:Extent
309:&
299:Region
47:Danian
400:is a
49:(pre-
777:ISSN
729:ISSN
665:and
428:and
396:The
361:1914
153:Type
66:PreꞒ
849:hdl
841:doi
829:414
916::
878:35
876:.
872:.
847:.
839:.
827:.
823:.
809:^
789:^
771:.
741:^
715:^
694:.
686:,
678:,
658:,
653:,
646:,
641:,
627:.
609:.
562:.
550:.
464:.
456:,
408:,
305:,
208:,
204:,
116:Pg
60:Ma
41::
906:)
902:(
857:.
851::
843::
835::
783:.
735:.
670:.
663:,
121:N
111:K
106:J
101:T
96:P
91:C
86:D
81:S
76:O
71:Ꞓ
55:~
53:)
45:-
20:)
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