Where: Santa Cruz, Argentina (48.4° S, 66.8° W: paleocoordinates 45.1° S, 25.4° W)

• small collection-level geographic resolution

When: La Matilde Formation, Bathonian (168.3 - 166.1 Ma)

• from two levels about 13 to 14 m apart within a 20 m unit of the local section (Stipanicic and Reig 1956)

•"Callovian-Oxfordian... the lacustrine rocks that yielded specimens of N. degiustoi in its type locality interdigitate with ignimbrites for which a Rb-Sr whole-rock isochron of 168 +/1 2 Ma [= Bathonian] was obtained (Pankhurst et al., 1998; Pankhurst et al., 2000)" (Báez and Nicoli 2008)

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine; lithified, tuffaceous, gray shale

Size class: macrofossils

Preservation: mold/impression

Collected by J. M. de Giusto, P. N. Stipanicic in 1954; reposited in the MACN

• see discussion in Stipanicic and Reig 1956

Primary reference: J. F. Bonaparte. 1981. Inventario de los vertebrados Jurásicos de América del Sur [Inventory of the Jurassic vertebrates of South America]. In W. Volkheimer & E. A. Musaccio (ed.), Cuencas Sedimentarias del Jurásico y Cretácico de América del Sur 2:661-684 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 92112: authorized by John Alroy, entered by John Alroy on 30.10.2009

Creative Commons license: CC BY (attribution)