Some Cretaceous Rocks
Yuzhnoe Intrusion - alkaline picrite (earliest Cretaceous, ~145 Ma)
from Jetty Peninsula, East Antarctica.
Steatite
(~pure talcose, non-foliated metamorphite) from the early Early Cretaceous (141
Ma) of Elliott Creek Ridge, Oregon, USA.
Yixian Formation - fossiliferous lacustrine shales with Sinosauropteryx
prima feathered dinosaur (left) & Lycoptera davidi fossil fish
(center) & Confuciusornis sanctus fossil bird (right) (near-lowermost
Cretaceous) from Liaoning Province, China.
Schlenblende - ~135 Ma botryoidal zinc-lead ore (pyrite-galena-sphalerite-wurtzite)
from the Pomorzany Mine, Poland. Zinc-lead-iron mineralization occurred
within Triassic dolostones during the early Early Cretaceous.
Chilwa Alkaline Province - carbonatite (late Barremian Stage, mid-Early
Cretaceous, 126 Ma) from Chilwa Island, Malawi.
Oka Carbonatite Complex - calciocarbonatite (left), okaite (left center),
ijolite (right center), and alnoite (right) (mid-Barremian Stage, mid-Early
Cretaceous, 124-125 Ma) from Oka Niobium Mine, Quebec, Canada.
"Sirenevyy Kaven" Deposit -
charoitite (charoitic metasomatite) (Aptian Stage, Early Cretaceous, 115-120
Ma) from the headwaters of the Davan-Ditmara streams, Siberia, Russia.
Bulldog Shale - fossiliferous shale with opalized Cyrenopsis fossil bivalves
(Aptian Stage, upper Lower Cretaceous) from the Coober Pedy Opal Field,
Australia.
Bellsbank Kimberlite - kimberlite (Aptian Stage, late Early Cretaceous,
118 Ma) from the Bellsbank Mines, South Africa.
Panda Hill Carbonatite - calciocarbonatite (Aptian Stage, late Early
Cretaceous, ~113 Ma) from Panda Hill, East African Rift Valley, Tanzania.
Mother Lode Gold Ore - quartz-gold hydrothermal veins from the Mother Lode
Gold Belt (late Early Cretaceous, ~108-127 Ma), Sierra Nevada foothills,
California, USA.
Blue Ball Lamproite Dike - lamproite (mid-Albian Stage, late Early Cretaceous,
~106 Ma) from Freedom Creek, Scott County, Arkansas, USA.
Prairie Creek Lamproite - weathered olivine lamproite (left) & lamproitic
volcanic tuff (right) (mid-Albian Stage, late Early Cretaceous, ~106 Ma) from
Crater of Diamonds, Arkansas, USA
Pala Pegmatite - lithia pegmatite (Albian Stage, late Early
Cretaceous, 104-105 Ma) from the Stewart Mine, California, USA.
Crowsnest Volcanics Formation - blairmorite (= porphyritic analcime phonolite) from
the mid-Cretaceous (~100 Ma) near Blairmore, Alberta, Canada.
Magnet Cove Complex - calciocarbonatite (left) & melanite garnet in
pseudoleucite syenite (right) from the mid-Cretaceous (Albian-Cenomanian
Stages, 96-102 Ma) of central Arkansas, USA.
Tamba Group - pinite from hornfels, contact metamorphosed in the early Late
Cretaceous (early Cenomanian Stage, ~98 Ma), from Mikata District, Honshu,
Japan.
Zihor Formation ("Jerusalem Limestone") - oolitic limestone
(Turonian Stage, lower Upper Cretaceous) from Israel.
Comus Formation contact metamorphosed by the Osgood
Mountain Stock -
andradite-diopside skarn with molybdenite & scheelite (Turonian Stage,
early Late Cretaceous, 92 Ma) from the Reilly Mine of Nevada, USA.
Alaskan Coast Plutonic Complex - garnet schist (Turonian Stage, early Late
Cretaceous, 89-92 Ma) from the roof pendant over a quartz diorite pluton at
Garnet Ledge, Alaska, USA.
Alto Parana’ba Igneous Province - ugandite from the Indai‡ II Intrusion (Late
Cretaceous, 80-90 Ma) near Rio Perdizos, Minas Gerais State, Brazil.
Niobrara Formation - fossiliferous chalk with Uintacrinus
crinoids (upper Santonian Stage, mid-Upper Cretaceous, ~84 Ma) from western
Kansas, USA.
Alto Parana’ba Igneous Province - bebedourite (alkaline clinopyroxenite) from the
Serra Negra-Salitre Complex (mid-Late Cretaceous, 83-84 Ma) near Arax‡, Minas
Gerais State, Brazil.
Dalnegorsk Skarn Deposit - calcite (left & center) and hematite-in-quartz
(right) (Late Cretaceous, 70-90 Ma) from Dalnegorsk, Russia.
Dalnegorsk Skarn Deposit - manganoan calcite (left), ilvaite-on-quartz
(center), and siderite (right) (Late Cretaceous, 70-90 Ma) from Dalnegorsk,
Russia.
PoŤos de Caldas Alkaline Complex - 76-78 Ma (Campanian Stage, late Late Cretaceous)
sodalite from a pegmatitic nepheline syenite on the PoŤos de Caldas Plateau,
Minas Gerais State, Brazil.
Butte Quartz Monzonite - 76 Ma (Campanian Stage, late Late Cretaceous)
quartz monzonite from east of Homestake, Montana, USA.
LappajŠrvi Impact Breccia - 73-77 Ma (Campanian Stage, early Late Cretaceous)
suevite (polymict impact breccia with frothy melt clasts) from the LappajŠrvi
Impact Crater, Finland.
Garnetite skarn (Late Cretaceous, 69-77 Ma) with molybdenite and ferrimolybdite
from near Brownes Lake, southwestern Montana, USA.
Troodos Ophiolite Complex - Late Cretaceous olivinitic chromitite from
Kokkinorotsos Mountain, Cyprus.
Quipar-Jorquera Formation - 65 Ma Cretaceous-Tertiary boundary clay (K-T clay)
from near Agost, Spain. More
info.