Materials provided at the workshop Geophysical map interpretation on the PC, convened April 21-22, 1993

1993 ◽  
Author(s):  
V.J. Grauch ◽  
J.D. Phillips ◽  
D.B. Hoover ◽  
J.A. Pitkin ◽  
K.E. Livo ◽  
...  
Keyword(s):  
Map Interpretation

Materials provided at the workshop Geophysical map interpretation on the PC, convened April 21-22, 1993

1993 ◽  
Author(s):  
V.J. Grauch ◽  
J.D. Phillips ◽  
D.B. Hoover ◽  
J.A. Pitkin ◽  
K.E. Livo ◽  
...  
Keyword(s):  
Map Interpretation

scholarly journals NEW MAPS FOR TEACHING TOPOGRAPHIC-MAP INTERPRETATION

1960 ◽  
Vol 8 (2) ◽  
pp. 54-57
Author(s):  
CHARLES H. SUMMERSON
Keyword(s):  
Topographic Map ◽  
Map Interpretation

Structural geology and map interpretation

1998 ◽  
Vol 292 (1-2) ◽  
pp. 169
Author(s):  
Rick Groshong
Keyword(s):  
Structural Geology ◽  
Map Interpretation

STATISTICAL MODELS FOR INTERPRETING AEROMAGNETIC DATA

Geophysics ◽  
1970 ◽  
Vol 35 (2) ◽  
pp. 293-302 ◽  
Author(s):  
A. Spector ◽  
F. S. Grant
Keyword(s):  
Power Spectrum ◽  
Central America ◽  
Power Spectra ◽  
Power Spectrum Analysis ◽  
Aeromagnetic Data ◽  
Mathematical Basis ◽  
Map Interpretation ◽  
Horizontal Size ◽  
Spectrum Characteristics ◽  
Depth Extent

A mathematical basis for the application of power spectrum analysis to aeromagnetic map interpretation is developed. An ensemble of blocks of varying depth, width, thickness, and magnetization is considered as a statistical model. With the use of the fundamental postulate of statistical mechanics, a formula which can be used to analyze the power spectrum of an aeromagnetic map is developed. The influences of horizontal size, depth, thickness, and depth extent of the blocks on the shape of the power spectrum are assessed. Examples which include power spectra of maps from Canada and Central America demonstrate the application of the approach. In the cases studied a double ensemble of blocks appears to best explain the observed power spectrum characteristics.

scholarly journals Belle Fourche River-Cheyenne River Drainage Divide Area in the Wyoming Powder River Basin Analyzed by Topographic Map Interpretation Methods, USA

2018 ◽  
Vol 10 (2) ◽  
pp. 1
Author(s):  
Eric Clausen
Keyword(s):  
River Basin ◽  
Powder River Basin ◽  
Normal Science ◽  
Topographic Map ◽  
New Paradigm ◽  
River Drainage ◽  
The North ◽  
Map Interpretation ◽  
New Research ◽  
Cheyenne River

The dearth of scientific literature in which specific erosional landform origins are determined is an example of what Thomas Kuhn considered a scientific crisis. Scientific crises arise when scientists following their discipline’s established paradigm’s rules, or doing what Kuhn calls normal science, cannot explain observed evidence. Scientific crises are resolved in one of three ways. Normal science may eventually explain the evidence and normal science returns, the unsolved problems may be identified and labeled and left for future scientists to solve, or a new paradigm may emerge with an ensuing battle over its acceptance. To succeed any new paradigm must demonstrate its ability to explain the previously unexplained evidence and also open up new research opportunities. During the 20th century’s first half regional geomorphologists abiding by their discipline’s paradigm rules unsuccessfully tried to explain origins of numerous erosional landforms, such as drainage divides and erosional escarpments. Their failures eventually caused the regional geomorphology discipline, at least that part of the discipline concerned with determining specific erosional landform origins, to almost completely disappear. A new and fundamentally different geomorphology paradigm that requires massive southeast-oriented continental ice sheet melt-water floods to have flowed across the Powder River Basin has the ability to explain specific erosional landform origins and is demonstrated here by using detailed topographic map evidence to show how large southeast-oriented floods eroded the Powder River Basin’s Belle Fourche River-Cheyenne River drainage divide segment, eroded through valleys now crossing that drainage divide segment, eroded the Powder River Basin’s Belle Fourche River valley, established Belle Fourche and Cheyenne River Powder River Basin tributary valley orientations, and eroded the north-facing Pine Ridge Escarpment. The success of this and other similar new paradigm demonstrations suggest many if not all specific erosional landform origins can be determined.

scholarly journals Using topographic map interpretation methods to determine Tookany (Tacony) Creek erosion history upstream from Philadelphia, Pennsylvania, USA

2016 ◽  
Vol 8 (4) ◽  
pp. 30
Author(s):  
Eric Clausen
Keyword(s):  
Drainage Basin ◽  
Walking Distance ◽  
Deep South ◽  
Topographic Map ◽  
Map Interpretation ◽  
Narrow Valley ◽  
Erosion History ◽  
Schuylkill River ◽  
Relationship Of ◽  
Flood Flow

Topographic map interpretation methods are used to determine erosional landform origins in and adjacent to the Tookany (Tacony) Creek drainage basin, located upstream from and adjacent to Philadelphia, PA. Five wind gaps notched into the Tookany-Wissahickon Creek drainage divide (which is also the Delaware-Schuylkill River drainage divide), a deep through valley crossing the Tookany-Pennypack Creek drainage divide, a Tookany Creek elbow of capture, orientations of Tookany Creek tributary valleys, a narrow valley carved in erosion resistant metamorphic bedrock, and the relationship of a major Tookany Creek direction change with a Pennypack Creek elbow of capture and a Pennypack Creek barbed tributary are used along with other evidence to reconstruct how a deep south oriented Tookany Creek valley eroded headward across massive southwest oriented flood flow. The flood flow origin cannot be determined from Tookany Creek drainage basin evidence, but may have been derived from a melting continental ice sheet, and originally flowed across the Tookany Creek drainage basin region on a low gradient topographic surface equivalent in elevation to or higher than the highest present day Tookany Creek drainage divide elevations with the water flowing in a complex of shallow diverging and converging channels that had formed by scouring of less resistant bedrock units and zones. William Morris Davis, sometimes referred to as the father of North American geomorphology, spent much of his boyhood and several years as a young man living in the Tookany Creek drainage basin and all landforms discussed here were within walking distance of his home and can be identified on a topographic map published while he was developing and promoting his erosion cycle ideas. Davis never published about Tookany Creek drainage basin erosion history, but he developed and promoted uniformitarian and erosion cycle models that failed to recognize the significance of Tookany Creek drainage basin erosional landform features providing evidence of the immense floods that once crossed present day drainage divides and eroded the Tookany Creek drainage basin.

scholarly journals Compression map: Improved means for studying Carboniferous foliage

2013 ◽  
Vol 49 ◽  
pp. 126 ◽  
Author(s):  
Erwin L. Zodrow ◽  
Jose A. D'Angelo
Keyword(s):  
Nova Scotia ◽  
Hydrofluoric Acid ◽  
Original Structure ◽  
Rock Matrix ◽  
Map Interpretation ◽  
Sont Encore ◽  
History Of

A medullosalean-pteridosperm specimen, 22 cm long, from the Sydney Coalfield, Nova Scotia, Canada, illustrates the advantage of studying the fossilization history of compressed foliage freed from the rock matrix by hydrofluoric acid, as compared to the examination of compressions still in the rock matrix. The image of any freed frond segment of compression foliage that has been reprocessed digitally to represent its original structure is called a compression map. Interpretation of a compression map is reliant on a physicogeochemical model of preservation processes.RÉSUMÉUn spécimen fossile d’une ptéridospermée du genre Medulossa mesurant 22 cm de longueur et excavé dans le bassin houiller de Sydney, en Nouvelle-Écosse (Canada), illustre bien l’avantage d’étudier l’histoire géologique de fossiles de feuilles extraits de la matrice rocheuse au moyen de l’acide fluorhydrique plutôt que d’examiner des compressions qui sont encore dans la matrice. On désigne carte de compression l’image d’un segment de fronde compressé extrait de la matrice dont on a fait l’extrapolation numérique pour voir sa structure originale. L’interprétation d’une carte de compression repose sur un modèle physicogéochimique des processus de préservation.[Traduit par la redaction]

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