Page 436 - Introduction to Paleobiology and The Fossil Record

DEUTEROSTOMES: ECHINODERMS AND HEMICHORDATES 423

Systems series stages Graptolite Formations Lithology fall rise Sequence Environmental features
Relative
-stratigraphic
and gaps in
sea level
units and
biozones and subzones
sedimen-
system tracts
tation
W. Centrifugus Upwelling
possibly
Insectus weakened
Lapworthi grandis MOTOL HST
Spiralis
Telychian Tullbergi UNIT 4
Griestoniensis
Crispus LITOHLAVY TST
Turriculatus hispanicus perturbations
Oceanic
Silurian Llandovery Linnaei palmeus sb (LST)
Sedgwickii
tenuis
Aeronian Convolutus richteri HST
Leptotheca
paradenticul.
Simulans
Triangulatus-Pectinatus ŽELKOVICE UNIT 3 TST Maximum
Cyphus
upwelling
Rhuddanian Vesiculosus atavus sb LST
Acuminatus
Anoxic
Ascensus HST turnover
shelly deglaciation
Persculptus UNIT 2 TST
Hirnantia
fauna
LST 2nd glacial
sb
? maximum
HST
interglacial
TST
Hirnantian KOSOV UNIT 1 1st glacial

Ordovician Ojsuensis (LST) maximum
Glaciation

pre-Hirnantian shelly ? sb HST Climatically
warm
fauna KR. DVUR period
Laticeps

storm sandstones,
shale, mudstone siltstones and shale limestone nodules
and lenticular beds
interbeds
graded sandstone alternating pale mudstone
black shale
and conglomerate and black shale
sandy/ silty-micaceous glaciomarine
laminite diamictite
Figure 15.30 Graptolite biostratigraphy of the Upper Ordovician–Lower Silurian strata of the
Barrandian basin. HST, highstand systems tract; TST, transgressive systems tract; LST, lowstand systems
ˇ
tract. (Based on Storch 2006.)