Hedberg H D (36 results)

Soft cover. Condition: Good. ORIGINAL Reprint/Offprint from 7th World Petroleum Congress; softcovers; scattered foxing spots; light creasing of corners of wraps and leaves, o/w in good condition. Journal.

Condition: New.

Soft Cover. Condition: Good. Softcovers; ex-library; tear on lower portion of front wrap and first leaf at gutter; minor shelfwear w/ light creasing of corners of wraps and leaves; o/w in good condition.

Soft Cover. Condition: Good. Softcovers; light stain to fore-edge of a few pages; o/w in good condition.

Condition: New.

Condition: New.

Condition: New.

paperback. Condition: Very Good.

Condition: New.

Pamphlet. Condition: Very Good. Vol 63, No 3, pp. 286-300, Photo Maps, Extracted from orig vol, thus begins with title page, trimmed & stapled pamphlet, else VG.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

PAP. Condition: New. New Book. Shipped from UK. Established seller since 2000.

Condition: New. In English.

Condition: New. In English.

Condition: New.

Condition: New. In English.

Condition: New.

Condition: New.

Condition: New. In English.

Condition: New. Idioma/Language: Español. La presente Guía estratigráfica internacional la ha preparado la Subcomisión Estratigráfica (SICE) para todos aquellos geólogos, sea cual fuera su actividad en los diversos campos de la Geología (tanto en el académico como el de la investigación o el industrial), que deseen expresar con mayor claridad sus observaciones, ideas y criterios sobre la estratigráfia, y que a su vez buscan entender mejor la información estratigráfica que otros aportan. Esta Guía va dirigida, en particular, a las necesidades de aquéllos cuyas actividades y proyectos son de alcance mundial o que, por lo menos, se extienden más allá de las fronteras de un solo país. *** Nota: Los envíos a España peninsular, Baleares y Canarias se realizan a través de mensajería urgente. No aceptamos pedidos con destino a Ceuta y Melilla.…

Condition: New. In English.

Condition: New. In English.

Rústica. Condition: New. Dust Jacket Condition: Nuevo. 1. La presente Guía estratigráfica internacional la ha preparado la Subcomisión Estratigráfica (SICE) para todos aquellos geólogos, sea cual fuera su actividad en los diversos campos de la Geología (tanto en el académico como el de la investigación o el industrial), que deseen expresar con mayor claridad sus observaciones, ideas y criterios sobre la estratigráfia, y que a su vez buscan entender mejor la información estratigráfica que otros aportan. Esta Guía va dirigida, en particular, a las necesidades de aquéllos cuyas actividades y proyectos son de alcance mundial o que, por lo menos, se extienden más allá de las fronteras de un solo país. LIBRO.…

Condition: Nuevo. La presente Guía estratigráfica internacional la ha preparado la Subcomisión Estratigráfica (SICE) para todos aquellos geólogos, sea cual fuera su actividad en los diversos campos de la Geología (tanto en el académico como el de la investigación o el industrial), que deseen expresar con mayor claridad sus observaciones, ideas y criterios sobre la estratigráfia, y que a su vez buscan entender mejor la información estratigráfica que otros aportan. Esta Guía va dirigida, en particular, a las necesidades de aquéllos cuyas actividades y proyectos son de alcance mundial o que, por lo menos, se extienden más allá de las fronteras de un solo país.…

In reply to a recent paper by Dr. Jost Wiedmann criticizing the position of the International Subcommission on Stratigraphie Classification (ISSO with respect to principles of stratigraphie classification, it seems necessary to re-emphasize the following points: 1. Stratigraphy is a broad subject covering all properties of rocks as strata. Important as are fossils in stratigraphie classification (biostratigraphic units), there are still many other kinds of stratigraphie units which it is also desirable to recognize (lithostratigraphic units, chronostratigraphic units, etc.) in portraying most usefully the Earth's stratigraphie sequence and the history of its origin. 2. Chronostratigraphic units, representing the rocks formed during specific timespans of earth history, are basic to grasping earth history. Biostratigraphy has been our most valuable aid to identifying and correlating chronostratigraphic units in much of the Earth's stratigraphie sequence; but it is not the only means and there are many parts of the sequence where fossil evidence is very inadequate. We need to utilize all available kinds of evidence in attempting to extend isochronous horizons and units as widely and with as great precision as possible. 3. A biostratigraphic unit (delimited by the limits of occurrence of certain fossils) is fundamentally different from a chronostratigraphic unit which is delimited strictly by isochronous horizons. The limits of a biostratigraphic zone, due to changes in depositional facies, variations in conditions for preservation of fossils, or vagaries of fossil discovery, cannot everywhere coincide with the same time horizons, whereas the boundaries of a chronostratigraphic zone must by definition be isochronous. Hence, while we can and do utilize biostratigraphic evidence to the greatest extent, we cannot correctly say that a biostratigraphic unit is necessarily a chronostratigraphic unit. In fact, a biostratigraphic marker rarely, if ever, constitutes a synchronous horizon worldwide through all kinds of strata. 4. Since our only record of the passage of geologic time lies in the rock strata, it is appropriate that our standards for division points of geologic time should be referred to designated points in the sequence of rock strata - boundary-stratotypes. Internationally agreed stratotypes appear essential to effectively define the scope of most chronostratigraphic units; they may be helpful for some kinds of biostratigraphic units, but are not applicable to other kinds of biostratigraphic units. The choice of stratotype limits for chronostratigraphic units must inevitably be somewhat arbitrary. In the standard chronostratigraphic hierarchy, the stratotypes of units of major rank should be the composites of stratotypes of units of lesser rank. 5. The ISSC is a widely representative international body (including in its membership not only individuals but almost all national stratigraphie committees) which attempts to study principles of stratigraphie classification and terminology and to formulate recommendations for their application. It welcomes constructive criticism from all geologists. There is nothing binding in its conclusions other than as they appeal to geologists in general as being worthy of following in the interests of international geological understanding and progress. 12 pp., 2 figs, stapled gr. 8.…

PAP. Condition: New. New Book. Shipped from UK. THIS BOOK IS PRINTED ON DEMAND. Established seller since 2000.

PAP. Condition: New. New Book. Delivered from our UK warehouse in 4 to 14 business days. THIS BOOK IS PRINTED ON DEMAND. Established seller since 2000.

Rústica. Condition: New. Dust Jacket Condition: Nuevo. 01. La presente Guía estratigráfica internacional la ha preparado la Subcomisión Estratigráfica (SICE) para todos aquellos geólogos, sea cual fuera su actividad en los diversos campos de la Geología (tanto en el académico como el de la investigación o el indu. LIBRO.…

Condition: As New. Unread book in perfect condition.

Condition: New.