Aceñolaza, Florencio G. <br/><br/>
El ordovícico de la zona de Arroyo Volcán, en la sierra de Sta.Bárbara, prov. de Jujuy. 

<br/><br/> Relevamiento: 1977. 
<br/><br/> This paper describes stratigraphical and paleontological characteriste at Ordovician auteroping bed in Arroyo Volcán área, in the Jujuy province.- This section at Volcán Group is refered, and tickness is 2250 m, and is formed by shales and sandstones. The fauna are composed by Geragnostus (Micragnostus) sp. Parabolinopsis mariana Hoek, Saltaspis cf S. steinmanni, Parabolinella argentinensis, Triarthrus tetragonadis, Angelina kayseri, Nonorthis grandis,Bucania eyrtohypha, Skolithos sp. and Cruziana furcífera. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Estratigrafía<br/>Ordovícico
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Arroyo Volcán<br/>Jujuy<br/>Sierra Santa Bárbara
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Artículo