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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.

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