Números 9-10 - Consejo Superior de Investigaciones Científicas
Números 9-10 - Consejo Superior de Investigaciones Científicas
Números 9-10 - Consejo Superior de Investigaciones Científicas
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CIENCIA<br />
dio, d'après King, 1944, 32) ... in zones<br />
5-7 of the Difunta section and less common<br />
at locality 30 (limestone layer 2 000<br />
meters S 47° W of Noria <strong>de</strong> Malascachas,<br />
d'après King, 1944, 32)", región <strong>de</strong> Las<br />
Delicias, Coahuila (Dunbar, C. O., 1944.<br />
45-46, láms. 15, fs. 1-5 y 16, fs. 1-4) "Polydiexodina<br />
capitanensis Dunbar y Skinner".<br />
Horizonte geológico: Pérmico <strong>Superior</strong> (serie<br />
Guadalupe <strong>de</strong> Texas).<br />
32) Polydiexodinn mexicana Dunbar<br />
IiOcalidad :<br />
"Found only in bed 2 of the Difunta section,<br />
at locality 9 (limestone lenses 25 meters<br />
east of El Indio, d'après King, 1944,<br />
31) ", región <strong>de</strong> Las Delicias, Coahuila<br />
(Dunbar, O. O., 1944, 47-48, lám. 16, figs.<br />
7-9) "Pohjdiexodina mexicana, n. sp."<br />
Horizonte geológico: Pérmico <strong>Superior</strong> (probablemente<br />
serie Ochoa <strong>de</strong> Texas).<br />
33) Polydiexodinn shumarili Dunbar y Skinner<br />
Localidad :<br />
"... common ... in bed 7 of the Difunta<br />
section at locality 20 (concretionary shale<br />
... along strike from Cerro Wenceslao on<br />
south to 300 meters west of El Indio on<br />
north, d'après King, 1944, 32) and 29 (limestone<br />
layer 2 400 meters S 2" W of Cerro<br />
Pichagüilla, d'après King, 1944, 32) of<br />
thea area about Las Delicias and in bed 2<br />
of the Malascachas section at locality 30<br />
(limestone layer 2 000 meters S 47° W of<br />
Noria <strong>de</strong> Malascachas, d'après King, 1944,<br />
32) ", Coahuila (Dunbar, C. O., 1944, 47,<br />
Gen. Eoverbeekina Lee, 1933<br />
34) Eoverbeekina americana Thompson y Miller<br />
localidad :<br />
"... extremely abundant throughout at<br />
least 50 ft. of a medium-gray to bluish-gray,<br />
massive to massively bed<strong>de</strong>d limestone<br />
member of the Paseo Hondo formation of<br />
Chiapas", región <strong>de</strong> Chicomuselo (Thompson,<br />
M. L. y A. K. Miller, 1944, 492-494,<br />
láms. 80, figs. 3-6 y 83, figs. 3-7) "Eover<br />
beekina americana Thompson y Miller, n.<br />
sp."<br />
Horizonte geológico: Formación Paseo Hondo,<br />
<strong>de</strong>l Pérmico Inferior (serie Leonard <strong>de</strong><br />
Texas).<br />
IN-CERTAE SEDIS:<br />
35) Fusul (nidos<br />
Localida<strong>de</strong>s:<br />
"In eastern Oaxaca, near Chivela, on the<br />
Tehuantepec railway . . . the limestones<br />
contain fusulines ..." (Baker, C. L., 1930,<br />
162-167) "Section on north si<strong>de</strong> of Caíión<br />
Gran<strong>de</strong>", valle <strong>de</strong> Acatita, Coahuila (Kelly,<br />
W. A., 1936, <strong>10</strong>18) "Massive reef limestone<br />
... with abundant ... fusulinids ... on<br />
Cerro Cobachi ..." al NE <strong>de</strong> Guaymas,<br />
Sonora (King, R. E., 1939, 1612, cuadro)<br />
"Casita-Arrastras area: 4 Km E of Chapal<br />
... dark-gray limestone ... including<br />
... fusulinids; Northern end of Sierra <strong>de</strong><br />
La Colorada: Cerro <strong>de</strong> San Francisco ...<br />
thinner bed<strong>de</strong>d limestone (containing) two<br />
species of fusulinids; Sierra do Santa Teresa;<br />
E of Willard ... limestone ... with<br />
some fusulinids (and) Cerro <strong>de</strong> La Flojera<br />
. .. massive- limestone . .. with fusulinids"<br />
(King, R. E., 1939, 1646, cuadro)<br />
Horizonte geológico: probablemente Pérmico<br />
Inferior (Wolfcamp y Leonard <strong>de</strong> Texas).<br />
SUMARIO<br />
Cierto número <strong>de</strong> capas <strong>de</strong> edad Paleozoico<br />
superior, con fusulfnidos y otros fósiles, se han<br />
encontrado en México. Des<strong>de</strong> Sonora a Chiapas,<br />
capas <strong>de</strong>l Pérmico y Pennsilvánico se extien<strong>de</strong>n a<br />
lo largo <strong>de</strong> un eje con dirección NW-SE. A pesar<br />
<strong>de</strong>l excelente trabajo <strong>de</strong> campo y laboratorio apenas<br />
se han <strong>de</strong>finido algunas formaciones y se<br />
han <strong>de</strong>scrito unas tres docenas <strong>de</strong> fusuI(nido3. Se<br />
necesitan más estudios en la parte norte <strong>de</strong>l país,<br />
lam. 16, figs. 5 y 6) "Pohjdiexodina shumar-<br />
don<strong>de</strong> pue<strong>de</strong>n establecerse más fácilmente las codi<br />
Dunbar y Skinner"<br />
rrelaciones con la sección tipo <strong>de</strong> Texas.<br />
Horizonte geológico: Pérmico <strong>Superior</strong> (serie<br />
Guadalupe <strong>de</strong> Texas).<br />
SUMMARY<br />
247<br />
A number of <strong>de</strong>posits of upper Paleozoic age,<br />
with fusulinids and other fossils, have been found<br />
in Mexico. From Sonora to Chiapas, Permian and<br />
Pcnnsylvanian beds stretch along an axis in a<br />
NW-SE direction. In spite of excellent field and<br />
laboratory work, only a few formations have been<br />
<strong>de</strong>fined, and some three dozen forms of fusulinids<br />
<strong>de</strong>scribed. There is need of more study in the<br />
northern part of the country, where correlations<br />
can more easily be establisehd with type section<br />
of Texas.<br />
M. MALDONADO-KOKRDELL<br />
Laboratorio <strong>de</strong> Paleontología, Gerencia <strong>de</strong> Exploración,<br />
Petróleos Mexicanos,<br />
México, D. F.