ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00272.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00273.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00274.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00275.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00276.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Higher crustaceans of distinctly modern type first diversified in the Lower Carboniferous. Some, from Scottish and Northern English localities, are exquisitely preserved, so that much can be inferred about their biology. Yet they seem to have been environmentally restricted, confined to close inshore marine fades and to lagoons and ponds of reduced, salinity. For all their apparent modernity, no Carboniferous crustaceans ever developed pincer–like claws, so common in modern types. Might this have been one of the factors that limited the

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00277.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Oceanic manganese nodules, for long the cornucopia of sea floor mineral deposits, have lost much of their economic attractiveness in recent years as a result of depressed metal prices and difficulties surrounding their potential extraction under the Law of the Sea Convention. In their place, commerical interest in mineral deposits within Exclusive Economic Zones has increased, while the scientific world is enamoured with the black smokers discharging at mid–ocean ridges and the polymetallic sulphides that precipitate from the

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00278.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

In the recent re–run of Alistair Cooke's TV series ‘America’, one of the most intriguing programmes was that on the pioneers trekking westwards from the Mississippi to California. Their journey took only four months. Today's tourist can fly the same distance in a little over two hours. The pioneers saw the geological marvels close at hand but few knew enough to appreciate them. The airborne tourist may know enough but can't see them. How does one overcome this problem? By an educational tour with a leader who knows the co

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00279.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00280.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

ISSN:0266-6979    

DOI:10.1111/j.1365-2451.1985.tb00281.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY