Calico Mountains Arthropod Beds (UA collection) (Miocene of the United States)

Where: San Bernardino County, California (35.0° N, 116.8° W: paleocoordinates 34.1° N, 111.3° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Upper Member (Barstow Formation), Hemingfordian (20.4 - 16.0 Ma)

• Overlying fine-grained lacustrine beds (here referred to as the Calico Member of the Barstow Formation) are bracketed between ca. 19 and 16.9 Ma, and are thus older than the type section of the Barstow Formation in the Mud Hills. Several 17.1-16.8 Ma calc-alkaline dacite domes intrude the Calico Member.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified, concretionary mudstone

• "lake sediments" indicating an environment analogous to that seen in Mono Lake, Big Soda Lake, and Soap Lake
• "microlaminated mudstones" including the fossiliferous concretions

Size class: mesofossils

Preservation: adpression, concretion

Collection methods: bulk, chemical, acetic,

• "Over 1000 concretions were collected and etched in a 10% acetic acid bath... residues were examined to identify and assess the relative anatomic preservation of fossils"

•University of Arizona collection

Primary reference: L. E. Park and K. F. Downing. 2001. Paleoecology of an exceptionally preserved arthropod fauna from lake deposits of the Miocene Barstow Formation, Southern California, U.S.A. Palaios 16(2):175-184 [J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 106431: authorized by John Alroy, entered by John Alroy on 15.03.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Cicadellidae
Euscelis sp. Brullé 1832 leafhopper
 Hemiptera - Lygaeidae
Miogonates sp. Sailer and Carvalho 1957 milkweed bug
Procymophyes sp. Sailer and Carvalho 1957 milkweed bug
 Hemiptera - Notonectidae
Notonectidae indet. Latreille 1802 true bug
 Hemiptera - Saldidae
Saldidae indet. Amyot and Audinet-Serville 1843 shore bug
 Thysanoptera - Thripidae
 Thysanoptera - Aeolothripidae
"Melanothrips sp." = Melanthrips
"Melanothrips sp." = Melanthrips Haliday 1836 thrips
 Psocodea -
Miotroctes sp. Pierce 1960 bark louse
 Blattodea - Stylotermitidae
Parastylotermes sp. Snyder and Emerson 1949 termite
 Blattodea - Termitidae
Gnathotermes sp. Holmgren 1912 termite
 Blattodea - Kalotermitidae
Cryptotermes sp. Banks 1906 drywood termite
 Hymenoptera - Formicidae
"Palaeosminthurus sp." = Camponotus
"Palaeosminthurus sp." = Camponotus Mayr 1861 ant
 Coleoptera - Staphylinidae
Carpelimus sp. Leach 1819 rove beetle
 Coleoptera - Cybocephalidae
Cybocephalus sp. Erichson 1844 beetle
 Coleoptera - Dytiscidae
Schistomerus californense Palmer 1957 predaceous diving beetle
 Diptera - Chironomidae
Calopsectra sp. Kieffer 1909 non biting midge
 Diptera - Ceratopogonidae
Dasyhelea antiqua Palmer 1957 biting midge
Johannsenomyia hotchkissae Pierce 1966 biting midge
Culicoides megacanthus Palmer 1957 biting midge
"Miopalpomyia sp." = Palpomyia Meigen 1818 biting midge
 Odonata - Libellulidae
Orthemis ferruginea Fabricius 1775 tropical king skimmer
plus two more unidentified libellulids
Collembola
 Entomobryomorpha - Entomobryidae
Branchiopoda
 Anostraca -
Anostraca indet. Sars 1867 branchiopod
Copepoda
  -
Cletocamptus sp. Schmankevitch 1875 copepod
Arachnida
 Araneae - Salticidae
Dendryphantes sp. Koch 1837 spider
 Araneae - Dictynidae
Argenna fossilis Petrunkevitch 1957 spider
 Araneae - Lycosidae
Lycosidae indet. Sundevall 1833 wolf spider
 Acariformes -
Protoarrenurus sp. Cook 1957 mite