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CONTRIB UTIONS FROM THE CUSHMAN FOUKDA'.rI ON FOR FORAMINIFERAL RESEARCH 1 CONTRIBUTIONS FROM THE CUSHMAN FOUNDATION FOR FORAMINIFERAL RESEARCH VOLUM E XX, PART 1, JANUARY, 1969 360. ASTRATlGRAPHIC SEQUENCE OF BENTHONIC SMALLER FORAMINIFERA FROM THE LA BOCA FORMATlON, PANAMA CANAL ZONE* GUSTAVO BLACUTl AND R. M. KLEINPELL2 INTRODUCTION (see text fi g. 2), and upward through some twenty The siltstones, mudstones, and dark clay of the feet of section, the La Boca is especially rich in La Boca Formation, early middle Tertiary of the Siphogell erilla transversa and other species of Panama Canal Zone, have long held more than smaller foraminifers. Benthonic foraminifers oc­ ord inary interest for students of American middle cur also below the Emperador Limestone Member, Tertiary foraminifers. The type locality of SipllO- about fifteen feet above the contact between the ell erilla trallsversa Cushman is in the La Boca La Boca and the underlying Las Cascadas Agglom­ 'ormation. Geographicall y widespread, this species erate, and also hi gher, about two hundred fift y feet curs stratigraphically near the horizons of sup­ above the base of the La Boca in outcrop. They posed boundary between the Oligocene and Mio· are also well developed through almost another two :ene Series. It also appears to be ancestral to sev­ hundred feet of beds stratigraphically still hi gher eral other stratigraphically significant species of in the La Boca, in the samples from the core hole iphogell erina in the Miocene of both the Atlantic mentioned, drilled about a thousand feet west of Seaboard and the Pacific Coast Ranges farther north. the outcrops (see text fig. 2). Originally recorded as in the Culebra Formation In 1965, a suite of nineteen foraminiferal sam­ oi the Canal Zone (Cushman 1918a, p. 41), the ples from this La Boca sequence, collected by W. strata at the type locality of S. trallsversa have sub­ P. Woodring from the outcrops and provided from sequently been assigned to the La Boca Formation. the cored subsurface sequence through the coop­ In turn the La Boca, once considered a marine eration of R. H. Stewart of the Panama Canal ember of the Panama Formation (Woodring Company, was sent to Gustavo Blacut in Califor­ I 57, p. 41 ; Cole 1964, p. 140 ) has subsequently nia for comparison with stratigraphic sequences been given formation rank (Woodring 1964, p. bearing Siphogell erina trallsversa in the West Coast . -I-t) . The locality in reference, U .S.G .S . no. 6010 Ranges. At th at time Blacut was working toward locality 130 of Woodring 1957, pI. 2, locality 9 of an M.A. degree at the University of California in Cole loc. cit.) "in dark cl ay," is about one-half Berkeley. By the summer of 1966 he was well ·Ie northwest of Pedro Miguel in the Panama along in his work on the La Boca foraminifers and Canal3 (see text fig . I). It was in the canal exca­ had launched his field work in California when ti on. There are no natural exposures nearby, suddenly leukemia brought to a tragic close this nothing is known about the stratigraphic po­ young man's promising career. iUion of this locality 6010 within the La Boca Blacut's type specimens, faunal slides, and notes Formation. At a locality about six miles north­ have been assembled by the junior author under t of Pedro Miguel, made available in 1965 as whose guidance his academic program had been result of widening of the Panama Canal in Gail­ conducted. The type specimens have been illus­ Cut, Siphogell erilla transversa was again found trated by Mary Taylor and the illustrations (Plates abundance. Here, on the west side of Las Cas­ 1·6) prepared for publication by Gordon Horna­ .:adas Reach, fresh exposures of the La Boca For­ day of the Museum of Paleontology at Berkeley . tion yielded a sequence of foraminiferal assem­ Although Bl acut's work in the Coast Ranges had ges from the base of the formation through a only begun, in view of the several published rec­ _. Kness of 250 feet (see text fig. 1 for the locality ords of the Coast Range fossil faunas with which - this measured foraminiferal sequence). An ad­ Siphogell erina trails versa is associated there it has . nal thickness of 195 feet was sam pled in cores been possible to place his study of the Panama ma­ ::-om a nearby core hole. From a stratigraphic terial within the context of these published Coast JlXizon about one hundred feet above the top of Range records and thus in part at least to put on Emperador Limestone Member of the La Boca record the substance of the study he was not granted time to complete. conlribution from the Museum of Paleontology, U n i- _",it,. of California. Berkeley. ACKNOWLEDGMENTS ::"""ased. Several people have in one way or another _ Jl::seum of Paleonlology, UniversityofCalifomia, Bel'keley. helped bring Bl acut's work through to posthumous N BO' 79· 4 5' 79D 30' I "' ~ ~ I I ~~ ~ ~ ,~ ~ '<­ u 9' 9' 15' 15' to t' ;.- () c:: ";.- Z 0 ~ t' ~ Z '1l t'l t' 'llf ;.- Z ;.- ~ 9' 1 ;.- () ;.- Z ;.- ~~" t' -- ~ '"0 Z ~~ '" t'l "l ~ 0 L a Chorrero <? :0 ;.- o S 10 Mlle. I ! , ~ ~ Z ~ "l l'J :0 TEXT FIGURE 1. LOCALITY MAP ;.. CONTRIBUTIONS FROM THE CUSHMAN FOU NDAT ION FOR FORAlIUNIFERAL RESEARCH 3 DEPTH B DEPTH IN FEET IN fEET OF SAMPLES O--,r-----..., Rtsidual clat, lilt, and sand - .. _ ... - ..- . ..._ -.... -.. _ .... _ ... "'-" ' - 39 ..' -" -_' .. --.-. '" 50 _ •.-=' .-.':=-'_'_' .-:=. .=.= '_': _" .. ...... - -"." ...._- -..._ ...--" ... --... 59 ...__ --" _.­ . ...... - ... ...-- --.. ..-- , - ..... : ',--=-:":.. ,---_ :~. ... ..... - -.......... -_ _- .. .. 85 :~.-.-.-. 98 100 .. -_.. -- ..... -_--... .. ••.__ ~-!..!: • • • .__ ... _- ... '-..-".-- '--'.. 118 ..._.-- -- .. ,-_... _-.. ._-.. .-_ .. ... --:-;-:--'-'.'.=- 136 .... - --...... - - .. 150 .. - .. ._ . .. ....... -- • -;-;-;... :..:..:..... _-,,;- - .... I S 9 . __...... -_ - ..... .._ _-.. .... -- -_.... '--... --..." ..__'-'". _ .. 177 THICKNESS A "-"... _-'-".. SAMPLES '-"'--" 192 IN FEET ......_. --... ..... .. 250 ; ':'.:_: }--410-10 200 __".-." ..._ __ :=,,_:.::::,::.:. ...... _ - .. ... .._ '-:-:-:- ....:..:..:..-..-. - .. "--"'--.. --.. - ' .--... - " . ~:o. · : :a,~':' '; : . :~.. ~~.~.~. i~~.~.~. ~~-----------~~~.~: ~~:~~~ .~.~·.~· ~.. ~·~ .. L L.pidocyclina mirof/ortJns/s ..~.....::~...... :-:- .._....... ...._...... : . 200 .. - ... _ .. 250 ..._.... ......- ... ... .. .. - ...... - -- .... _... .. - ............... .... -_...... __ ... -- ...... ... 262.8-.L.;..· ;,.' ;,.' ;,.. ,;,..,;,..;,..=,;,. ' ". _ " _' - "'-" · - '- ' ', :-:-=':'': .. "'.- -"..... --.- ' - .... '". .. -... _... -... .. ' E:~~~~~~~.. ~:~.- .~_-o~~· ·~:~. 1J~~:g:~ 150 ~_.. ;-. -=_..... 410-7 ~~~~ :...._. _=. .. - :.-:=" ...::".-'.=. -",'..0="1:::::::410- 410-56 410- 4 ~ ~ t=::=:3 ~ ·. -._._._...... _" _:-::.= ..:r- ...... siltstone lilty cloy and calcariOUS --:...-._--- ... _-- ..---. sandstone mudstone Ilitstoni ... _ ... - ... .... .. ' , ~ . [23• .• • ..0· ., 100 "· :-==.:..::-:-- " '--=.:....-:-:- '" .' . -":.~' . '. l lmlltone oQOlomerott oggk)mlrofic vitric tuff •. • • --:-:7.:..:..:...-:7':... ..• , • luff .._ - ..-. _... · - ' .: :-:-=:..:.- '., , ' - . • ; :':'=-:": ' 50 . ' . ~~~ .. 50 75FEET " - "'--'" EmPlrador I I - } Limestone Mlmber 410-1 ---=--------=--=----- o ----- 0 0 a odD: 0 0 o5S)o Q ••• O.·.~AoQ-o LAS CASCADAS AGGLOMERATE Sections of La Boca Formation on west side of Los Cascadas Reach, Panama Conal. A. Outcrop section opposite Canal station 1622 . Measured by W. P. Woodring. B. Core hole LBW 149, 1,000 feet west of outcrop section . Logged by R. H. Stewart. TEXT FIGURE 2. COLUMNAR SECTION 4 BLAC CT A N D KLI~I;\,PELL-PANAl\1A CAN AL ZONE FORA1\UNll'-" ERA presentation. Thanks are especially due W. P. -about here in the column-in small numbers. Woodring of the U. S. National Muse um who col­ The balance of the higher La Boca beds bear fora­ lected the outcrop samples, contributed the field minifers of small size for their respective species data from Panama, and provided the map and and faunules that are notable for their content of columnar sections; R. H . Stewart, through whose sharp-peripheried non ion ids, finely costate uviger­ cooperation the core samples were made available; inids, small robulids, cassidulinids and anomalinids, Miss Ruth Todd and K. Norman Sachs, Jr., of the and some globigerinids. These higher La Boca U. S. Geological Survey, for pertinent commentary faunules appear to be of more nearly shallow shelf­ on more or less associated planktonic and larger sea depositional origin, but lived in waters still foraminifera from the La Boca, respectively; Zach connected at the surface with the open ocean. M. Arnold, editor for the Cushman Foundation; Thus, except for its lowermost hundred feet or D. E. Savage, Gordon Hornaday and Mary Taylor, so of beds which were deposited in shallow water of the Museum of Paleontology, University of protected from open-ocean currents, the La Boca California, Berkeley; and the Museum of Paleon­ Formation on the west side of Las Cascadas Reach tology for financial assistance. would appear to have been deposited under normal THE FORAMINIFERA marine conditions at medium depths: for a time The smaller foraminifers and their di stribution somewhat beyond the edge of the continental shelf in the surface and subsurface sections of the La but subsequently above those depths, on the shelf Boca Formation on the west side of Las Cascadas itself though still in waters connected with the Reach, Panama Canal, are shown in text fig. 3. open ocean. More than sixty species or varieties of benthonic foraminifers
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    Journal of Structural Geology 28 (2006) 494–507 www.elsevier.com/locate/jsg Structural development of the Peregrina–Huizachal anticlinorium, Mexico Y. Zhou *, M.A. Murphy, A. Hamade Department of Geosciences, University of Houston, Houston, TX 77204, USA Received 21 March 2005; received in revised form 5 November 2005; accepted 17 November 2005 Available online 25 January 2006 Abstract The Sierra Madre Oriental fold belt is a NW–SE-trending contractional belt that spans nearly the entire length of Mexico. This area underwent Triassic–Middle Jurassic rifting and Late Cretaceous–Early Cenozoic shortening. Our structural investigation of the Peregrina–Huizachal anticlinorium in east central Mexico shows that its development is characterized by two phases of deformation: an early thin-skinned phase and a late thick-skinned phase. A detachment developed at the contact between the rift sedimentary rock and overlying limestone. During the thin- skinned phase, deformation of the Upper Jurassic–Cretaceous strata is accommodated by a series of detachment folds and faults. The rift boundary faults are sub-perpendicular to the late stage compression in east central Mexico. This makes rift-related faults prone to be inverted as reverse faults. During the thick-skinned phase, the basement in the rift is uplifted along two opposing reverse faults and experience internal deformation. Its uplift contributed to the growth of the Peregrina–Huizachal anticlinorium. q 2006 Elsevier Ltd. All rights reserved. Keywords: Detachment; Anticlinorium; Basement reactivation; Red beds 1. Introduction The geometry and timing of basement-involved structures are not clear. Some studies have interpreted the basement to be The Sierra Madre Oriental (SMO) fold–thrust belt stretches bounded by Laramide-style high-angle reverse faults, postdat- nearly 1500 km from northern to southern Mexico.
  • A New Sphenodontian (Lepidosauria: Rhynchocephalia)

    A New Sphenodontian (Lepidosauria: Rhynchocephalia)

    View metadata, citation and similar papersDownloaded at core.ac.uk from http://rspb.royalsocietypublishing.org/ on February 13, 2017 brought to you by CORE provided by CONICET Digital A new sphenodontian (Lepidosauria: Rhynchocephalia) from the Late Triassic of Argentina and the early origin of the herbivore opisthodontians rspb.royalsocietypublishing.org Ricardo N. Martı´nez1, Cecilia Apaldetti1,2, Carina E. Colombi1,2, Angel Praderio1, Eliana Fernandez1,2, Paula Santi Malnis1,2, 1,2 1 1 Research Gustavo A. Correa , Diego Abelin and Oscar Alcober 1Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, Avenida Espan˜a 400 Norte, Cite this article: Martı´nez RN, Apaldetti C, 5400 San Juan, Argentina Colombi CE, Praderio A, Fernandez E, Malnis 2Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas, CONICET, Buenos Aires, Argentina PS, Correa GA, Abelin D, Alcober O. 2013 A new sphenodontian (Lepidosauria: Rhyncho- Sphenodontians were a successful group of rhynchocephalian reptiles that dominated the fossil record of Lepidosauria during the Triassic and Jurassic. cephalia) from the Late Triassic of Argentina Although evidence of extinction is seen at the end of the Laurasian Early and the early origin of the herbivore Cretaceous, they appeared to remain numerically abundant in South America opisthodontians. Proc R Soc B 280: 20132057. until the end of the period. Most of the known Late Cretaceous record in http://dx.doi.org/10.1098/rspb.2013.2057 South America is composed of opisthodontians, the herbivorous branch of Sphenodontia, whose oldest members were until recently reported to be from the Kimmeridgian–Tithonian (Late Jurassic). Here, we report a new sphenodontian, Sphenotitan leyesi gen.