ORIGIN OF PHOSPHATIC BLACK SHALE FACIES IN PENNSYLVANIAN CYCLOTHEMS OF MID-CONTINENT NORTH AMERICA.HECKEL PH.1977; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; U.S.A.; DA. 1977; VOL. 61; NO 7; PP. 1045-1068; BIBL. 2 P. 1/2; 7 ILL.Article

RECOGNITION OF ANCIENT SHALLOW MARINE ENVIRONMENTS.HECKEL PH.1972; SOC. ECON. PALEONTOLOGISTS MINERALOGISTS, SPEC. PUBL.; USA; 1972, NUM. 0016, P. 226 A 286Miscellaneous

PENNSYLVANIAN STRATIGRAPHIC REEFS IN KANSAS, SOME MODERN COMPARISONS AND IMPLICATIONSHECKEL PH.1972; GEOL. RDSCH.; DTSCH. ; 1972, VOL. 61, NUM. 0002, P. 584 A 598Serial Issue

POSSIBLE INORGANIC ORIGIN FOR STROMATACTIS IN CALCILUTITE MOUNDS IN THE TULLY LIMESTONE, DEVONIAN OF NEW YORK.HECKEL PH.1972; J. SEDIMENT. PETROL.; USA; 1972, VOL. 42, NUM. 0001, P. 7 A 18Miscellaneous

SIGNIFICANCE OF VERTICAL SEQUENCE, LATERAL CHANGE, AND PHOSPHATIC BLACK SHALE FACIES IN MIDCONTINENT UPPER PENNSYLVANIAN MEGACYCLOTHEMS.HECKEL PH.1976; GEOL. SOC. AMER., ABSTR. PROGRAMS; U.S.A.; DA. 1976; VOL. 8; NO 6; PP. 911Conference Paper

SOLENOPORID RED ALGAE (PARACHAETETES) FROM UPPER PENNSYLVANIAN ROCKS IN KANSAS.HECKEL PH.1975; J. PALEONTOL.; U.S.A.; 1975, VOL. 49, NUM. 0004, P. 662 A 673Serial Issue

STRATIGRAPHY AND DEPOSITIONAL FRAMEWORK OF THE STANTON FORMATION IN SOUTHEASTERN KANSAS.HECKEL PH.1975; KANSAS GEOL. SURV., BULL.; U.S.A.; 1975, NUM. 0210, P. 1 A 45Serial Issue

DEVONIAN TULLY LIMESTONE IN PENNSYLVANIA AND COMPARISON TO TYPE TULLY LIMESTONE IN NEW YORK.HECKEL PH.1969; ILLINOIS STATE GEOL. SURV., CIRC.; USA; 1969, NUM. 0060, P. 1 A 33Miscellaneous

BASIC FACIES PATTERN OF OUTCROPPING UPPER PENNSYLVANIAN LIMESTONES IN THE MIDCONTINENT.(ABSTRACTHECKEL PH.1968; GEOL. SOC. AMER., ABSTR. PROGRAMS; USA; 1968Miscellaneous

CARBONATE BUILDUPS IN THE GEOLOGIC RECORD. A REVIEW.HECKEL PH.1974; SOC. ECON. PALEONTOLOGISTS MINERALOGISTS, SPEC. PUBL.; U.S.A.; 1974, NUM. 0018, P. 90 A 154Serial Issue

DEVONIAN WORLD PALAEOGEOGRAPHY DETERMINED FROM DISTRIBUTION OF CARBONATES AND RELATED LITHIC PALAEOCLIMATIC INDICATORSHECKEL PH; WITZKE BJ.1979; SPEC. PAPERS PALAEONTOL.; GBR; DA. 1979; NO 23; PP. 99-123; BIBL. 3 P.; 8 ILL.Conference Paper

DEVONIAN WORLD PALAEOGEOGRAPHY DETERMINED FROM DISTRIBUTION OF CARBONATES AND RELATED LITHIC PALAEOCLIMATIC INDICATORSHECKEL PH; WITZKE BJ.1979; SPEC. PAPERS PALAEONTOL.; GBR; DA. 1979; NO 23; PP. 99-124; BIBL. 3 P.; 1 ILL.; 7 CART.Conference Paper

A SIGNIFICANT ACROCRINID (CRINOIDEA: CAMERATA) FROM THE LADORE SHALE (MISSOURIAN, UPPER PENNSYLVANIAN) IN EASTERN KANSASSTRIMPLE HL; HECKEL PH.1978; KANSAS GEOL. SURV., BULL.; USA; DA. 1978; VOL. 211; NO 4; PP. 5-9; BIBL. 4 REF.; 4 ILL.Article

ENVIRONMENTAL INTERPRETATION OF CONODONT DISTRIBUTION IN UPPER PENNSYLVANIAN (MISSOURIAN) MEGACYCLOTHEMS IN EASTERN KANSAS.HECKEL PH; BAESEMANN JF.1975; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; USA; 1975, VOL. 59, NUM. 0003, P. 486 A 509Serial Issue

PHYLLOID ALGAL-MOUND COMPLEXES IN OUTCROPPING UPPER PENNSYLVANIAN ROCKS OF MID-CONTINENT.HECKEL PH; COCKE JM.1969; AMER. ASS. PETROLEUM GEOLOGISTS BULL.; USA; 1969(5), VOL. 53, NUM. 0005, P. 1058 A 1074Miscellaneous

THE TULLY LIMESTONE OF CENTRAL NEW YORK-STRATIGRAPHY AND FACIES VARIATIONCUBITT JM; HECKEL PH; DELSIGNORE AG et al.sdNEW YORK STATE GEOLOGICAL ASSOCIATION. ANNUAL MEETING. 50/1978/SYRACUSE NY; USA; SYRACUSE UNIVERSITY; DA. S.D.; PP. 273-285; BIBL. 4 REF.; 4 ILL.Conference Paper