Model optimisation in exploration geophysics edited by A. Vogel, Vieweg, distributed by John Wiley,...
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208 BOOK REVIEWS than the thoracopods. The trunk region includes the thorax, bearing seven pairs of biramous limbs, and a limbless abdomen. The ‘compound median eye’ or ‘paired compound eye’ has not yet been resolved; omma- tidial structures have not been observed. Nearly six pages are then given over to larval development in which five instars are described; an adult Bredocaris being just under 1 mm long. Functional morphology and mode of life occupy some four pages. The adult Bredocaris is assumed to have lived epibenthically. The body was able to achieve considerable dorso-ventral flexure but whether the limb motion was synchronous or out-of-phase has not been determined. The final section is on affinities in which the authors point out the uniqueness of Bredocaris from all other known maxillopods and propose a new order (Orstenocarida - what else!) and family which is at pres- ent monogeneric. There are 1 I composite line text figures, six text photographs, and 16 plates. This volume did come with a useful detached Iist of abbreviations. Having almost become blase about the high quality of SEM photographs I suppose the highlight for me was the beautifully executed plasticine models (text figures 12-17) and the photographic tricks to reproduce a bila- terally symmetrical animal. The level of science and art is truly impressive. The volumes are a must for any trilobiteiarthropod worker and every institution should have copies in their library. M. ROMANO MODEL OPTIMISATION IN EXPLORATION GEO- PHYSICS edited by A. Vogel, Vieweg, distributed by John Wiley, 1987. No. of pages: 369. Price: C42.50 (hard- back). This text represents the Proceedings of the 1985 and I986 International Mathematical Geophysics Seminar. It contains 24 papers on the subject of inversion of geo- physical data into models of subsurface physical struc- ture and improving the efficiency, accuracy, and appropriateness of inversion methodology. The papers are grouped by discipline into chapters on: seismology; geoelectrics; gravity/magnetic methods; and on ‘general methodology’ and ‘basic mathematics’. The last of these topics is the opening section: it will appear quite daunting to most earth scientists, for whom the mathematics will be anything but ‘basic’ and the very formal presentation (Theorem; Proof; Corollory; Lemma; etc.) without applications to ‘real’ problems will be hard to penetrate. More familiar territory (or dia- grams, anyway) follows in gravity and magneticmethods, where between the formulae will be found, for example. a useful technique for modelling dykes and a cautionary PLANKTON STRATIGRAPHY edited by H. M. Bolli, J. B. Saunders and K. Perch-Nielsen, Volume 1: Plankto- nic foraminifera, calcareous nannofossils and calpionel- lids. No. of pages: 599. Volume 2: Radiolaria, diatoms, silicoflagellates, dinoflagellates and ichthyoliths, Cam- bridge University Press, 1989. No. of pages: 407. Price: &30 (paperback). These two volumes constitute the paperback edition of the extremely popular hardback book of the same title. The text is exactly the same as the original and has not been updated but instead of the original tome, the paperback provides an opportunity to buy separate parts of the original: the calcareous plankton (foramini- fera, calcareous nannofossils, and calpionellids) and the illustration of the shortcomings of assuming uniform magnetization in modelling. The short section on geo- electrics also includes some actual observational data. The seismological papers concentrate mainly on process- ing and analysis of reflection data, though a contribution by Soviet and Bulgarian authors adds a more academic flavour to the mixture with a tomographic study of the lithosphere beneath Southeastern Europe. The closing section, on ‘general approaches’ includes a helpfully- illustrated appraisal of how inversion methods can be viewed as converging to a numerical solution. This is not a text to come to, or to gain much from, without an extensive mathematical vocabulary. My per- sonal feeling is that (while recognizing the economic real- ities of publishing) the ‘hardback’ price is high for what could be seen as merely a bound collection of manu- scripts in sometimes joltingly-disparate camera-ready founts. Nevertheless, it is a snapshot of progress in a complex subject and a book that should reside on library shelves as a signpost for the most theory-orientated among us. R. CLARK other major planktonic groups (radiolaria, diatoms, sili- coflagellates, dinoflagellates, and ichthyoliths). Plankton stratigraphy has already been reviewed by the Geological Journal (see Geol. J., 22, Spring thematic set, pp. 218- 219). This work is simply the best book ever published for micropalaeontologists involved in Cretaceous to Holocene plankton biostratigraphy. It is a bible. Although the splitting of the original and the reduction in price is to be applauded, the work could have easily been further reduced to separate volumes covering each group providing the option for buyers to only obtain the detail they required. PAUL LEARY
Transcript of Model optimisation in exploration geophysics edited by A. Vogel, Vieweg, distributed by John Wiley,...
208 BOOK REVIEWS
than the thoracopods. The trunk region includes the thorax, bearing seven pairs of biramous limbs, and a limbless abdomen. The ‘compound median eye’ or ‘paired compound eye’ has not yet been resolved; omma- tidial structures have not been observed. Nearly six pages are then given over to larval development in which five instars are described; an adult Bredocaris being just under 1 mm long. Functional morphology and mode of life occupy some four pages. The adult Bredocaris is assumed to have lived epibenthically. The body was able to achieve considerable dorso-ventral flexure but whether the limb motion was synchronous or out-of-phase has not been determined. The final section is on affinities in which the authors point out the uniqueness of Bredocaris from all other known maxillopods and propose a new order
(Orstenocarida - what else!) and family which is a t pres- ent monogeneric. There are 1 I composite line text figures, six text photographs, and 16 plates. This volume did come with a useful detached Iist of abbreviations. Having almost become blase about the high quality of SEM photographs I suppose the highlight for me was the beautifully executed plasticine models (text figures 12-17) and the photographic tricks to reproduce a bila- terally symmetrical animal. The level of science and art is truly impressive.
The volumes are a must for any trilobiteiarthropod worker and every institution should have copies in their library.
M. ROMANO
MODEL OPTIMISATION IN EXPLORATION GEO- PHYSICS edited by A. Vogel, Vieweg, distributed by John Wiley, 1987. No. of pages: 369. Price: C42.50 (hard- back).
This text represents the Proceedings of the 1985 and I986 International Mathematical Geophysics Seminar. It contains 24 papers on the subject of inversion of geo- physical data into models of subsurface physical struc- ture and improving the efficiency, accuracy, and appropriateness of inversion methodology. The papers are grouped by discipline into chapters on: seismology; geoelectrics; gravity/magnetic methods; and on ‘general methodology’ and ‘basic mathematics’.
The last of these topics is the opening section: it will appear quite daunting to most earth scientists, for whom the mathematics will be anything but ‘basic’ and the very formal presentation (Theorem; Proof; Corollory; Lemma; etc.) without applications to ‘real’ problems will be hard to penetrate. More familiar territory (or dia- grams, anyway) follows in gravity and magneticmethods, where between the formulae will be found, for example. a useful technique for modelling dykes and a cautionary
PLANKTON STRATIGRAPHY edited by H. M. Bolli, J . B. Saunders and K. Perch-Nielsen, Volume 1: Plankto- nic foraminifera, calcareous nannofossils and calpionel- lids. No. of pages: 599. Volume 2: Radiolaria, diatoms, silicoflagellates, dinoflagellates and ichthyoliths, Cam- bridge University Press, 1989. No. of pages: 407. Price: &30 (paperback).
These two volumes constitute the paperback edition of the extremely popular hardback book of the same title. The text is exactly the same as the original and has not been updated but instead of the original tome, the paperback provides an opportunity to buy separate parts of the original: the calcareous plankton (foramini- fera, calcareous nannofossils, and calpionellids) and the
illustration of the shortcomings of assuming uniform magnetization in modelling. The short section on geo- electrics also includes some actual observational data. The seismological papers concentrate mainly on process- ing and analysis of reflection data, though a contribution by Soviet and Bulgarian authors adds a more academic flavour to the mixture with a tomographic study of the lithosphere beneath Southeastern Europe. The closing section, on ‘general approaches’ includes a helpfully- illustrated appraisal of how inversion methods can be viewed as converging to a numerical solution.
This is not a text to come to, or to gain much from, without an extensive mathematical vocabulary. My per- sonal feeling is that (while recognizing the economic real- ities of publishing) the ‘hardback’ price is high for what could be seen as merely a bound collection of manu- scripts in sometimes joltingly-disparate camera-ready founts. Nevertheless, it is a snapshot of progress in a complex subject and a book that should reside on library shelves as a signpost for the most theory-orientated among us.
R. CLARK
other major planktonic groups (radiolaria, diatoms, sili- coflagellates, dinoflagellates, and ichthyoliths). Plankton stratigraphy has already been reviewed by the Geological Journal (see Geol. J. , 22, Spring thematic set, pp. 218- 219). This work is simply the best book ever published for micropalaeontologists involved in Cretaceous to Holocene plankton biostratigraphy. It is a bible. Although the splitting of the original and the reduction in price is to be applauded, the work could have easily been further reduced to separate volumes covering each group providing the option for buyers to only obtain the detail they required.
PAUL LEARY
