The marine biota from the middle Pennsylvanian outcrops of the Sierra Agua Verde, located in mid-eastern Sonora, consists of phylloid algae of the genera Komia and Eugonophyllum and a number of invertebrates. These species include bioaccumulations of chaetetids; brachiopods of the genera Dielasma sp., Reticulariina sp., Anthracospirifer sp., Antiquatonia sp.; bryozoans of the genus Thamniscus; tabulate corals such as Syringopora and solitary corals such as Zaphrentis; fusulinid foraminifera such as Pseudostaffella, Eoshubertella texana, Fusulinella llanoensis, and Zellerella; gastropods of the genus Euomphalus and Donaldina; and the crinoid genera Cyclocaudex, Cyclocrista, Heterosteleschus, Lamprosterigma, Mooreanteris, Pentagonopternix, Preptopremium, Cycloscaspus, and Pentaridica. The material was collected from outcrops in the first 512m of the La Joya Formation, and their sediments have a total thickness of 780m and consist of limestone interbedded with calcareous mudstone and sandstone lenses. The age of the middle Pennsylvanian strata corresponds to that of the Atokan stage (311 million years). The species assemblages are typical of a shallow tropical marine benthos. The analysis of the distribution of the species allowed for the determination of their paleogeographic relationships with the components of the biota of the Carboniferous strata of Texas and Kansas in the United States of America, which belong to the province of the North American Craton.

The marine biota from the middle Pennsylvanian outcrops of the Sierra Agua Verde, located in mid-eastern Sonora, consists of phylloid algae of the genera Komia and Eugonophyllum and a number of invertebrates. These species include bioaccumulations of chaetetids; brachiopods of the genera Dielasma sp., Reticulariina sp., Anthracospirifer sp., Antiquatonia sp.; bryozoans of the genus Thamniscus ; tabulate corals such as Syringopora and solitary corals such as Zaphrentis ; fusulinid foraminifera such as Pseudostaffella , Eoshubertella texana , Fusulinella llanoensis , and Zellerella ; gastropods of the genus Euomphalus and Donaldina ; and the crinoid genera Cyclocaudex , Cyclocrista , Heterosteleschus , Lamprosterigma , Mooreanteris , Pentagonopternix , Preptopremium , Cycloscaspus , and Pentaridica . The material was collected from outcrops in the first 512 m of the La Joya Formation, and their sediments have a total thickness of 780 m and consist of limestone interbedded with calcareous mudstone and sandstone lenses. The age of the middle Pennsylvanian strata corresponds to that of the Atokan stage (311 million years). The species assemblages are typical of a shallow tropical marine benthos. The analysis of the distribution of the species allowed for the determination of their paleogeographic relationships with the components of the biota of the Carboniferous strata of Texas and Kansas in the United States of America, which belong to the province of the North American Craton. | La biota marina procedente de afloramientos del Pensilvánico medio de la sierra Agua Verde localizada en la región centro este de Sonora, está conformada por algas filoides de los géneros Komia y Eugonophyllum ,por numerosos invertebrados entre ellos bioacumulaciones de chaetétidos, braquiópodos de los géneros: Dielasma sp., Reticulariina sp., Anthracospirifer sp., Antiquatonia sp., briozoarios fenestélidos del género Thamniscus , corales tabulados como Syringopora y solitarios como Zaphrentis , foraminíferos-fusulínidos entre ellos Pseudostaffella , Eoshubertella , Fusulinella, Zellerella , gasterópodos de los géneros Euomphalus y Donaldina , y numerosos géneros de crinoideos Cyclocaudex , Cyclocrista , Heterosteleschus , Lamprosterigma , Mooreanteris , Pentagonopternix , Preptopremium , Cycloscaspus , Pentaridica . El material fue recolectado en afloramientos de los primeros 512 m de la formación La Joya, cuyos sedimentos tienen un espesor total de 780 m y están formados por caliza intercalada con lodolita calcárea y lentes de arenisca. La edad de los estratos corresponde al Pensilvánico Medio (Atokano) con una antigüedad de 311 millones de años. La tanatocenosis es típica del bentos de mares tropicales someros. El análisis de la distribución de las especies permitió establecer relaciones paleogeográficas con componentes de la biota del Carbonífero de Texas y Kansas en los Estados Unidos de Norteamérica, pertenecientes a la provincia del Cratón Norteamericano.

The marine biota from the middle Pennsylvanian outcrops of the Sierra Agua Verde, located in mid-eastern Sonora, consists of phylloid algae of the genera Komia and Eugonophyllum and a number of invertebrates. These species include bioaccumulations of chaetetids; brachiopods of the genera Dielasma sp., Reticulariina sp., Anthracospirifer sp., Antiquatonia sp.; bryozoans of the genus Thamniscus; tabulate corals such as Syringopora and solitary corals such as Zaphrentis; fusulinid foraminifera such as Pseudostaffella, Eoshubertella texana, Fusulinella llanoensis, and Zellerella; gastropods of the genus Euomphalus and Donaldina; and the crinoid genera Cyclocaudex, Cyclocrista, Heterosteleschus, Lamprosterigma, Mooreanteris, Pentagonopternix, Preptopremium, Cycloscaspus, and Pentaridica. The material was collected from outcrops in the first 512m of the La Joya Formation, and their sediments have a total thickness of 780m and consist of limestone interbedded with calcareous mudstone and sandstone lenses. The age of the middle Pennsylvanian strata corresponds to that of the Atokan stage (311 million years). The species assemblages are typical of a shallow tropical marine benthos. The analysis of the distribution of the species allowed for the determination of their paleogeographic relationships with the components of the biota of the Carboniferous strata of Texas and Kansas in the United States of America, which belong to the province of the North American Craton.