gold-bearing metamorphic slates are of this age. Marine Jurassic rocks have not been clearly identified on the Atlantic side of America. The Patuxent and Arundel formations (non-marine) are doubtfully referred to this period. Lower and Middle Ilurassic formations occur in Argentina and Bolivia. Jurassic roc s have been recognized in Asia, including India, Afghanistan, Persia, Kurdistan, Asia Minor, the Caspian region, Japan and Borneo. The best marine development is in Cutch, where the following groups series=Bathonian. In the western half of the Salt Range and the Himalayas, Spiti shales are the equivalents of the Europea n Callovian and Kimeridgian. The upper part of the Gondwana series is not improbably Jurassic. On the African continent, Liassic strata are found in Algeria, and Bathonian formations occur in Abyssinia, Somaliland, Cape Colony and western Madagascar. In Australia the Permo-Carboniferous formations are succeeded in Queensland and Western Australia by what may be termed the Jura-Trias, which include the coal-bearing “ Ipswich " and “

Sub ta e -

Stages* Ammonite Zones if g S Von A' <1'=L=1PP='f'=“f» Tmzté' Al ine Buch th ed P

Quenstedt 5

Purbeckien s:

Purbeckian Perisphinctes transitorius or;§ 3 Aquilonien g 5

— . Q

5 . Perisphinctes giganteus . t g » 2 Portlatldlan Olcostephanus gigas Q. Q B01-10315;-| if E Dtphya-K3lk€ <~ — =» —- z= <~ A ...gl

R . k. d .E Virgulien “fig %l¢dS”m Kimeridgian CIDEC la CU. OXUS 5:E 1- D E 8 E g Oppeha tenullobata 5 3 Eg, o 3 ¢, .a..) V 7, Pteroceran 3- SSE +5

c> -5 o

ri -'-";“”'. 3 -5 94 a”

D- A ' N E “ .2

Coralhan Pertoceras bxmammatum H 5- Rstartlfm § . 9 .g E 5 auracien Q, Q ..

rn w U7 2 E .2

— — A . - < 3

-A I

CE; 8 Oxfordian Peltoceras transversarium rgovlen 3 5 5 -g G Aspidoceras perarmatum a. ii? mg § p E Neuvizien O Q,

2 J E J 5 E

Peltoceras athleta Q' - - '; .

H Calm Cosmocefasiason E§ x;§ B;:§ :;§ : Q 5 Q Macrocephalites macrocephalus Q 6 'fi an — — -~ ~ .

1 0 Q*

S2 v1 Bathonian Oppfilia a§ P'd°'de5. 5 E Bathonien ° < ¥l;(;i;1(>Slfxips) 5);, Q Parkinsonia ferrugmea pg § . Klauss Beds -4 'Q

22, 8 Parkinsonia Parkinsoni '5 § (N' Alps)

3 *-' . Coeloceras Humphresianus gg 3 - ' 1

"' E?i2h'f5§ iil>I;Oolite) 5P'"?"2°e"°'S Saul? ' 5 E Baiocien 3 Sami Kalke A ilonmnla SowQ»:rbylil 7 § arpoceras urc isonae B Ooutf of San —*l Vi iio

assa e beds) Harpoceras (Lioceras) o almum o. g 8 P

- Lytoceras jurense I

Upper has Posidonia Bronni e TOHYCIEH Amaltheus spinatus 6 0 §

Amaltheus margaritatus 5 §

Middle I-1aS Dactylioceras Davoei S Charmouthien Q2 Phylloceras ibex 'Y 13 S, ', ;, ' m Aegoceras Jamesoni 'Q SEE.;

- - Q ., , g-we ba

Q Arietites raricostatus 13 és S 32%, § B 3 Oirynoticeras oxynotum, Q -§ S 0 SPE p Lower Li S Arietites obtusus 2:1 .ul Q, 'g<f1§ 3 Arietites Buckiandi 9 -5', ,, g U Schlotheimia angulata 5 Smemoupen 3 'gg;; § Psrloceras planorbis 41 ' »-I H€ft9~I1El€¥1 1 1 BQ Q ear: >, ,, Q 5, E

Hettan len Q E 5

(parti »11'§ ,3 1;

Rhétien <°:>. 2

JI L/l LD

5

are distinguished from above downwards: the Umia series=Portlandian and Tithonian of south Europe, passin upwards into the Neocomian; the Katrol series=Oxfordian (part) and Kimeridgian; the Chari series=Callovian and part of the Oxfordian; the Patcham 1 Purbeckian from the “ Isle ” of Purbeck. Aquilonien from Aquilo (Nord). Bononien from Bononia (Boulogne). Virgulien from Exogyra virgula. Pleroceran from Pteroceras oceani. Astartien from Aslarte supracorallina. Rauracien from Rauracia (Jura). Argovien from Argovie (Switzerland). Neuvizien from Neuvizy (Ardennes). Divesien from Dives (Calvados). Bathonien from Bath (England). Bajocien from Bayeux (Calvados). T oarcien from Toarcium (Tours). Charmouthien from Charmouth (England). Sinemourien from Sinemurum, Semur (Cote d'Or). Hettangfien from Hettange (Lorraine).

Burrum " formations

of Queensland. In New Zealand there is a thick series of marine beds with terrestrial plants, the Mataura series in the upper part of Hutton's Hokanui system. Sir J. Hector included also the Putakaka series (as Middle Jurassic) and the Flag series with the Catlin's River and Bastion series below. Jurassic rocks have been recorded from New Guinea and New Caledonia. Life in the Jurassic Period.-The expansion of the sea during this period, with the formation of broad sheets of shallow and probably warmish water, appears to have been favourable to many forms of marine life. Under these conditions several groups of organisms developed rapidly along new directions, so that the Jurassic period as a whole came to have a fauna differing clearly and distinctly from the preceding Palaeozoic or succeeding Tertiary faunas. lin the

seas, all the main groups were represented as they are to-day