Riker Hill Quarry (unit 23) (Jurassic of the United States)

Also known as Roseland Quarry, Riker Hill Fossil Site, Walter Kidde Dinosaur Park

Where: Essex County, New Jersey (40.8° N, 74.3° W: paleocoordinates 21.4° N, 20.7° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: B Member (Towaco Formation), Hettangian (201.3 - 199.3 Ma)

• subunit 23c = bed q = Unit h

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; black, carbonaceous siltstone and sandstone

• "laminate composed of laminae of dark organic-rich siltstone alternating with light carbonate laminate forming couplets 0.4 mm thick. Upper part of unit consists of beds of graded sandstones and siltstones with minor intraformational conglomerate made up of the laminate."

Size class: macrofossils

Preservation: adpression

Collection methods: quarrying, surface (in situ),

Primary reference: P. E. Olsen. 1980. The latest Triassic and early Jurassic formations of the Newark Basin (eastern North America): stratigraphy, structure, & correlation. The Bulletin of the New Jersey Academy of Science 25(2):25-51 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 187198: authorized by Matthew Carrano, entered by Matthew Carrano on 17.07.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Semionotiformes - Semionotidae
Semionotus sp. Agassiz 1843
"abundantly preserved"