page_title: List of the Mesozoic life of California
section_title: H
hierarchical_section_title: List of the Mesozoic life of California / H
caption_attribution_description: English: Fossil shell of Hedenstroemia tscherskii from Madagascar, on display at Gallery of Paleontology and Comparative Anatomy, Paris.
context_page_description: This list of the Mesozoic life of California contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of California and are between 252.17 and 66 million years of age.
context_section_description: Haliotis
  †Halobia
  †Halobia austriaca
  †Halobia cordillerana
  †Halobia gigantea
  †Halobia ornatissima
  †Halobia rugosa
  †Halobia superba
  †Hauericeras
  †Hauericeras angustum
  †Hauericeras churchi – type locality for species
  †Hauericeras mickeyi – type locality for species
  †Hauerites
  †Hauerites lawsoni – type locality for species
  †Haydenia
  †Haydenia impressa
  †Hecticoceras
   †Hedenstroemia
  †Hedenstroemia kossmati
  †Helena
  †Helena exquisita
  †Helicaulax
  †Helicaulax popenoei – type locality for species
  Hemiaster
  †Hemiaster californicus
  †Hemicidaris
  †Hemicidaris intumescens
  †Hemicryptocapsa
  †Hemicryptocapsa ruesti – or unidentified related form
    Heptranchias
  †Hertleinites
  †Hertleinites aguila
  †Hertleinites pecki
  †Heteroderma
  †Hexasaturnalis
  †Hexasaturnalis hexagonus
  †Hexasphaera
  †Hexasphaera baumgartneri
  †Higumastra
  †Higumastra boucoti
  †Higumastra devilsgapensis
  †Higumastra dumitricai
  †Higumastra imbricata
  †Higumastra inflata – or unidentified related form
  †Higumastra transversa
  †Hilarisirex
   Hipponix
  †Hipponix dichotomus
  †Hiscocapsa
  †Hiscocapsa acuta
  †Hiscocapsa japonica – or unidentified comparable form
  †Hiscocapsa robusta
  †Hokkaidoconcha
  †Hokkaidoconcha bilirata – type locality for species
  †Hokkaidoconcha morenoensis – type locality for species
  †Hokkaidoconcha occidentalis
  †Hokkaidoconcha tehamaensis – type locality for species
  †Holcodiscoides
  †Holcodiscoides gorrilli – type locality for species
  †Holcophylloceras – tentative report
  †Hollisites
  †Hollisites inflatus
  †Hollisites lucasi
  †Holocryptocanium
  †Holocryptocanium astiensis
  †Holocryptocanium barbui
  †Holocryptocanium geysersensis
  †Holocryptocanium tuberculatum
  †Homerites
  †Homerites semiglobosus
  †Homoeoparonaella
  †Homoeoparonaella barbata
  †Homoeoparonaella elegans
  †Homoeoparonaella gigantea
  †Homoeoparonaella glinesi
  †Homoeoparonaella radians
  †Homoeoparonaella scurrae
  †Homolsomites
  †Homolsomites mutabilis
  †Hoplocrioceras
  †Hoplocrioceras ducanense
  †Hoplocrioceras duncanense
  †Hoplocrioceras remondi
  †Hoplotropites
  †Hoplotropites jokelyi
  †Hormathospongia – type locality for genus
  †Hormathospongia dictyota – type locality for species
  †Hsuum
  †Hsuum baldfacense
  †Hsuum brevicostatum
  †Hsuum maxwelli
  †Hsuum mclaughlini
  †Hsuum naturale
  †Hsuum obispoensis
  †Hsuum rutogense
  †Hsuum santamariaense
  †Hsuum speciosum
    †Hybodus
  †Hybodus shastensis – type locality for species
  †Hydrotherosaurus – type locality for genus
  †Hydrotherosaurus alexandrae – type locality for species
  †Hyphantoceras
  †Hyphantoceras ceratopse
  †Hyphantoceras venustum – or unidentified comparable form
  †Hypophylloceras
  †Hypophylloceras onoense – or unidentified related form
caption: Fossilized shell of the Triassic ammonoid cephalopod Hedenstroemia
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