PBDB Collection

Osawa Riverbed, Sayama Hills (Pleistocene of Japan)

Where: Tokyo, Japan (35.8° N, 139.4° E: paleocoordinates 36.1° N, 139.0° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Sayama Formation, Early/Lower Pleistocene (2.6 - 0.8 Ma)

• "The horizon of fossil assemblage was 13 m below the Sayama-gomashio tephra bed (SGO) dated to 1.64 ± 0.1 Ma by the fission track (FT) method (Muramatsu, 2008) and 16 m above the Sayama-garasushitu tephra bed (SYG) dated to 1.81 ± 0.1 Ma by the FT method (Muramatsu, 2008)." (Ito et al. 2017)

• bed-level stratigraphic resolution

Environment/lithology: fluvial; siltstone and sandstone

• "The Sayama Formation is composed of alternating sand and silt beds that are approximately 50 m thick with intercalated gravel layers (Saitama Res. Group & Kanto Quat. Res. Group, 1970; Nirei & Takegoshi, 2007). Leaf fossils were in 3 m thick fluvial silt that was conformably overlain by 7 m of marine sediment." (Ito et al. 2017)

Size class: macrofossils

Preservation: adpression

Primary reference: A. Ito, A. Momohara, and Z. K. Zhou. 2017. Pleistocene fossil leaflets of Albizia kalkora (Roxb.) Prain (Leguminosae subfamily Mimosoideae) from central Honshu, Japan, and its implications for historical biogeography. Japanese Journal of Historical Botany 26(1):3-13 [B. Allen/B. Allen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 224546: authorized by Bethany Allen, entered by Bethany Allen on 18.03.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Ginkgoopsida
Ginkgoales - Ginkgoaceae	Ginkgo biloba Ginkgo biloba ginkgo
Dicotyledoneae
Ericales - Ericaceae	Ericaceae indet. Ericaceae indet. Jussieu 1789 heather
Myrtales - Lythraceae	Lagerstroemia indica Lagerstroemia indica Linnaeus 1759 crepe myrtle
Angiospermae
Fabales - Fabaceae	Fabaceae indet., Cercis chinensis, Albizia kalkora, Wisteria floribunda, Lespedeza cyrtobotrya Fabaceae indet. Lindley 1836 legume Cercis chinensis redbud Albizia kalkora Roxburgh 1820 legume Xishuangbanna Tropical Botanical Garden, AI0001, AI0002 Wisteria floribunda legume Lespedeza cyrtobotrya bush clover
Rosales - Rosaceae	Rosa cf. multiflora Rosa cf. multiflora rose
Rosales - Ulmaceae	Celtis sinensis, Zelkova serrata, Ulmus davidiana Celtis sinensis hackberry Zelkova serrata zelkova Ulmus davidiana elm var. japonica
Rosales - Pomaceae	Sorbus cf. commixta Sorbus cf. commixta
Malpighiales - Salicaceae	Salix gilgiana, Salix sieboldiana, Salix subfragilis Salix gilgiana willow Salix sieboldiana willow Salix subfragilis willow
Fagales - Betulaceae	Ostrya cf. japonica, Alnus cf. japonica, Carpinus laxiflora, Carpinus tschonoskii, Betula grossa Ostrya cf. japonica hophornbeam Alnus cf. japonica alder Carpinus laxiflora hornbeam Carpinus tschonoskii hornbeam Betula grossa birch
Fagales - Fagaceae	Fagus crenata, Fagus japonica, Fagus stuxbergi, Quercus serrata, Quercus (Prinus) sp., Quercus gilva, Quercus (Cyclobalanopsis) sp., Quercus acutissima Fagus crenata beech Fagus japonica beech Fagus stuxbergi beech Quercus serrata oak Quercus (Prinus) sp. Linnaeus 1753 oak Quercus gilva oak Quercus (Cyclobalanopsis) sp. Oersted ring-cupped oak Quercus acutissima Carruthers 1862 oak
Malvales - Tiliaceae	Tilia sp. Tilia sp. Linnaeus 1753 linden
Sapindales - Sapindaceae	Acer palmatum, Acer pictum, Acer diabolicum, Aesculus turbinata Acer palmatum maple Acer pictum Thunberg 1784 maple Acer diabolicum Blume 1864 maple Aesculus turbinata soapberry
Laurales - Lauraceae	Cinnamomum camphora, Cinnamomum tenuifolium, Lindera umbellata Cinnamomum camphora cinnamon Cinnamomum tenuifolium cinnamon Lindera umbellata laurel
Liliales - Smilacaceae	Smilax china Smilax china greenbrier
Saxifragales - Cercidiphyllaceae	Cercidiphyllum cf. japonicum Cercidiphyllum cf. japonicum katsura
Saxifragales - Hamamelidaceae	Liquidambar formosana Liquidambar formosana sweetgum
Lamiales - Oleaceae	Fraxinus japonica Fraxinus japonica ash

Coniferales - Cupressaceae	Cunninghamia lanceolata Cunninghamia lanceolata Hooker 1827 Chinese fir var. konishii
Polypodiopsida
Polypodiales - Polypodiidae	Pteris cf. cretica Pteris cf. cretica