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Leiosphaeridia and Pterospermella acritarch genera as shallowing phase indicators in the early Jurassic, North Sinai, Egypt

Crossref DOI link: https://doi.org/10.1007/s12517-014-1500-1

Published Online: 2014-07-17

Published Print: 2015-07

Update policy: https://doi.org/10.1007/springer_crossmark_policy