The Proceedings of the International
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2018
Creationist commentary on and analysis of tree- ring data: A review
DOI: https://doi.org/10.15385/jpicc.2018.8.1.38
Roger W. Sanders
Core Academy of Science
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Recommended Citation
Sanders, R.W. 2018. Creationist commentary on and analysis of
Conference on Creationism, ed. J.H. Whitmore, pp.
Sanders, R.W. 2018. Creationist commentary on and analysis of
CREATIONIST COMMENTARY ON AND ANALYSIS OF
A REVIEW
Roger W. Sanders, Core Academy of Science, PO Box 1076, Dayton, TN 37321 rsanders4175@gmail.com
ABSTRACT
This paper 1) reviews the creationist literature concerning the use of tree growth rings in determining the ages of long- lived trees, developing
2)suggests positive research directions using these data to develop creationist models of biblical earth history. Only a single author attempted to use
Flood until now. This paper calls for research into six areas (biblical studies, physiology of tree growth,
KEY WORDS
tree growth rings,
INTRODUCTION
In botany class a student learns that as trees grow in girth they produce a characteristic growth ring in the wood that marks one annual increment. The inner circumference of the ring is light- colored, forming in the rapid growth of spring and early summer; the outer circumference is darker and denser, formed during the slower growth of late summer and completes the ring as the tree goes dormant for the winter. Thus, from the outer margin of the dark wood of one ring to the outer margin of dark wood of the adjacent ring is one year’s growth. Of course, this is only a generalization that must be
Dendrochronology, the science of using tree rings to obtain ages of trees, assumes the growth rings are annual increments unless there is some compelling reason to verify otherwise. Dendrochronologists also generate composite
for example, timber used in ancient buildings and, hence, the age of the buildings themselves. Assumptions are also made about the
effect of weather conditions on the characteristics of the rings and
about extrapolating present conditions into the past. Besides using tree rings to estimate tree ages and obtain extended chronologies, these data are used to interpret past climatic conditions.
Interestingly, two events converged to make this all relevant to creationism. In 1961 The Genesis Flood (Whitcomb and Morris 1961) was published and initiated the resurgence of young earth creationism among evangelicals. A few years before this, dendrochronologists discovered and counted the supposedly oldest living tree, an individual of a bristlecone pine (BCP) species (Pinus longaeva, the Great Basin BCP) called “Methuselah,” in the arid White Mountains of southeastern California near tree line (Earle 2018). It has over 4,600 rings, which, if these represent years, is close to the time when many creationists would date the Flood. Thus, creationists began to think of ways to use dendrochronology to support biblical chronologies and model past environments. However, later in the 1960s dendrochronologists began generating a composite BCP
Therefore, most of the attention on tree rings by creationists has
Copyright 2018 Creation Science Fellowship, Inc., Pittsburgh, Pennsylvania, USA www.creationicc.org
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been on this BCP master chronology. However, some authors have commented on master chronologies based on other
Therefore the purpose of this paper is to review and discuss this extensive creationist commentary on and analysis of
REVIEW OF CREATIONIST PUBLICATIONS 1. Initial enthusiasm for dendrochronology
Whitcomb and Morris (1961) developed a general model of the Genesis Flood and
pp.
2. Biblical constraints on chronology
It became apparent to Whitcomb and Morris (1961, App. II) that, when harmonizing historical chronologies with biblical data, one must be aware of various factors affecting the biblical exegesis. They give a lengthy discussion why it may be appropriate to consider there to be gaps in the biblical chronologies totaling as much as three or four thousand years, bringing Creation to about 10,000 years ago. Aardsma (1990, 1993a, 1993b) uses similar reasoning to biblically justify a Flood date about 14,000 years ago.
Brown (1990), in discussing dendrochronology and calibrating
Most
2004) have accepted chronology based on the MT without gaps. Some authors (mostly those of letters in response to articles, e.g., Forgay 1993; Heinze 1995; Taylor 1993; Whitelaw in Aardsma 1990) appear to be emotionally committed to an Ussherian chronology.
3.Critiques of assumptions and general methods of dendrochronology
As creationists realized that master
One of the earliest writers to relate dendrochronology to biblical history was Robert H. Brown; he also wrote extensively about radiocarbon dating. Brown (1968) concluded that tree rings established a precise and reliable chronology back to 59 BC but was less confident of earlier dates. He suggested that prior to 59 BC three ring counting possibly overestimates ages by 500 to 1,000 years. Later Brown (1990) related this to complacency and explicitly stated that BCP is not well suited to chronology. Sorenson (1976), Wiant (1977a), Gladwin (1978), and Setterfield (1986) also agree on the issue of complacent growth. Gladwin
(1978) also notes that disjunct populations of BCP in southeast California, southwest Utah, and central Arizona do not yield the same ring patterns for the same years.
Sorenson (1976) and Setterfield (1986) added the argument that BCP have up to 30% extra false rings and up to 10% missing rings. Sorenson and Gladwin (1978) both were frustrated that the master chronology was the work of one lab (University of Arizona), which would not release its raw data for critical review. Gladwin, who took a workshop at the University of Arizona, discovered there was personal rivalry with researchers at the Carnegie Institution of Washington such that the lab director in Arizona was highly defensive of anyone questioning his work. Based on an earlier critique by Sorenson (1973), Raaflaub (1974) issued a call for interested members of the American Scientific Association to conduct research for publication on
Armstrong (1976) cited work on Scots pine showing cyclic variation in ring width. He argued that if this is true in trees of unknown age, this could cause errors in
In an effort to experimentally generate multiple rings in Rocky Mountain BCP (Pinus aristata), Lammerts (1983) raised seedlings in a growth chamber, inducing
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1993; Lorey 1994; Matthews 2006; Woodmorappe 2003a).
According to certain dendrochronologists, false rings have a “signature” of a “fuzzy” terminal edge instead of a sharp edge. However, Lammerts did not find the signature in his experimental plants and argues that false rings formed by the “San Francisco pattern” should not have the signature, as well. Matthews (2006) likewise found evidence that BCP largely lacked such signatures.
Matthews (2006) reviewed the conventional literature on BCP dendrochronology, especially those papers providing support for multiple rings per annual increment. He developed a novel perspective that appears to have merit. Matthews hypothesized that multiple rings per year is an adaptation to aridity in BCP trees that are under stress. That is, production of “late wood” (he calls “dark wood”) serves to limit evaporative loss to just one narrow band of “spring wood” (he calls “light wood”). Of particular interest is his demonstration that, as part of the tree dies back to a narrower strip of cambium and smaller number of supported leafy branches, the wood cells immediately after die back are larger in diameter demonstrating reduction of stress to the cells remaining alive after die back. He, as well as Woodmorappe (2003b), also points to trees downslope in better watered and sheltered locations. These trees may be about the same actual age but have thicker rings that number only in the hundreds, not thousands, before dying.
Downes (2010) summarized his research in tree physiology that demonstrates that the
Several popular apologetic articles argue for multiple rings per year, due largely to irregularities in the arid climate in which the BCP lives (anonymous author of response letter in Woodmorappe 2009b; Batten without date; Morris 2012; Snelling 2017; Thompson 2010, 2014). All of these authors rely on reports of tree physiology in
4.Critiques of computerized methods of dendrochronology Wiant (1977a) reviewed the
(e.g., normalized), but he argued that this would be valid only if there were no missing rings. He pointed out that complacent ring series can give high positive correlations. By analogy with pine species native to Mexico, he argued for multiple false rings in BCP when the climate should have been warmer after the Genesis Flood. False rings from drought or insect defoliation followed by regrowth become more frequent in the Mexican species the further south the trees grow. Of course, he assumes that BCP was in its current location almost immediately after the Flood. The same argument was used by Lorey (1994), Heinze (1995) and Bates (2003).
In a more recent paper, Brown (1995) argues likewise that positive correlation coefficients can lead to spurious
Using these same basic arguments as many of the authors above, Hebert et al. (2016) and Snelling (2017) emphasize the fallacy of numerous assumptions used to interpret tree rings in single trees, as well as the master chronologies. Both papers specifically criticize the BCP master chronology by citing the secular literature, with Snelling (2017, p. 58) saying, “The living trees account for only 1,200 years of the chronology, and the whole chronology depends on the accuracy of only two
5.Support and use of dendrochronology with creationist interpretations
Woodmorappe (2003a, 2003b, 2004, 2009a, 2009b) accepts the validity of the annual nature of rings in BCP in his thorough review of modern dendrochronology methods and biology of the BCP. In particular he explains stripbark growth in BCP, which is an adaptation to aridity and cold stress. That is, the tree increases in girth around its full circumference only until it reaches a certain size when the roots can no longer obtain the water and nutrient resources to support a full crown of leaves of an increasingly larger tree. At that point, much of the cambium dies except for a small strip on one side of the tree. The tree trunk then assumes a flattened shape, and only a few branches remain alive directly above the growing strip of wood.
Furthermore, Woodmorappe (2003b), in his field studies noticed that the “old” logs, which are supposed to have been lying in the elements for three to seven thousand years, do not look that old. Matthews (2006) adds the argument that even though a foot or more
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of rock is supposed to have eroded away from underneath, they still are where they fell! Woodmorappe’s (2003a, 2003b) studies convinced him that dead trunks did not exceed more than about 3,000 growth rings, with most having considerably fewer rings than the oldest livings trees. Woodmorappe (2003a) argues that
6.Critiques of calibrating radiocarbon dating with dendrochronology
The physics and math of radiocarbon dating are beyond the scope of this paper, but this section attempts to provide the context of radiocarbon dating as it relates to dendrochronology. As one of the earliest creationists to attempt to correlate
10% increase in
Two other early authors working with Egyptian artifacts expressed concerns about the impact dendrochronology calibration of
Long’s (1973) main argument was that
concluded that the BCP calibration curve was not valid for other locations, and that a separate curve would have to be calibrated with different species occurring at low elevation and as close to Egypt as possible.
Setterfield’s (1986) perspective is colored by his model of the decay of the speed of light since Creation. In his model, cosmic radiation has varied widely, which in turn would cause wide deviations in the
Tyler (1977) challenged the validity of the dendrochronology calibration of radiocarbon dates. He did accept conventional reports that
7.Creationist models harmonizing radiocarbon dating with dendrochronology
Most of the remaining creationist literature on
In a response exchange (Aardsma and Brown 1991; Aardsma 1992), Aardsma pointed out that Brown’s conversion would require a BCP living about 6000 BP to make 580 rings in 80 years, or 7 rings/ year. Other cases would require up to 20 rings/year in ring series predating 3500 BP. He also said this would require 26 rebuildings of Jericho in 70 years instead of 1,000 years. Brown replied that Jericho at that time had much higher rainfall and the rebuildings were just 26 repairings. To this, Aardsma (1992) replied that he could not find any reference to the high rainfall, which Brown did not document.
Aardsma (1990) also developed his own
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about 1500 BP with an increase to modern levels as the oceans became saturated and reach equilibrium with the atmosphere. Extrapolating the parabola to the left, the curve intersected zero at approximately 11,500 to 12,000 BP. By allowing a period of one to two millennia for an Ice Age to cool the oceans to near current temperatures and allow for amount of
Aardsma’s paper (1990, pp.
1)
Aardsma (1993a) continued his research to attempt to answer such objections. He used
Shortly afterward, Brown (1995) came to question the validity of
Other authors have argued for inaccuracies in the calibration curves. Beasley (1993) suggested that uptake of
also said that wood resins would keep groundwater carbonates out, and radiocarbon extraction methods remove all but the cellulose fraction. He pointed to the close match between the master chronology of Irish oak (alluded to by Johns [1993] in his letter supporting Aardsma [1993a]) and BCP to show that the patterns are not due to local conditions. Taylor (1995) countered by suggesting that the long tree chronologies could be accounted for by whole BCP trees floating and rerooting after the Flood. They should have many rings because they were created that way with the “appearance of age.” Using the same reasoning, Lorey (1994) and Heinze (1995) naively suggested that the White Mountains persisted through the Flood and that the BCPs survived the Flood in place and resumed growth afterwards.
More recently, Woodmorappe (2001, 2003a) developed a novel explanation to account for the discrepancies between the dendrochronologically calibrated radiocarbon dates and biblical chronology. He cited conventional evidence of
8.
As Downes (2010) has shown (see Point 3 above),
Using this type of data, Wise (1992) has modeled the presence of seasonality in the
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frosts, although it may have been more moderate than today’s climate. The data also support the conclusion that Flood transport was via very strong
DISCUSSION
In theory when the
Indeed, relating tree rings to time has become a major challenge for creationists. After dendrochronology labs published master
Giem (1997) reviewed the various creation models for converting
Table 1. Giem’s (1997) summary of the various creation models for converting
consensus that radiocarbon dating is objective and reproducible and is validated back to at least 300 BC by other dating methods, he found that the models differ in several assumptions, including
1)constant vs. variable
Giem offered three pertinent testable predictions (among many possible) to make these models falsifiable. One is to test the
To augment Giem’s suggestions, I consider that the following issues are critical in clarifying and/or verifying assumptions as the basis of developing date conversion models:
1.Biblical studies critically analyzing the genealogy and historical texts.
2.Verification of the time increments represented by growth rings.
3.Development of accurate models of global and local
4.Geologic placement of the
5.Complete understanding of
6.Biogeographic history of the tree species used for dendrochronology calibration curves.
1.Biblical studies critically analyzing the genealogy and historical texts
Hebrew scholars are needed to review the literature interpreting the Old Testament texts that are pertinent to developing a biblical chronology. Then a thorough analysis of the texts, rooted in the authority of Scripture, is needed to evaluate the previously published interpretations and present a novel chronology, if required. Until the issue is resolved of whether gaps in the genealogies (and Israelite administrations) is exegetically correct, there can be no meaningful advances made in developing dating conversions.
2.Verification of the time increments represented by growth rings
It is not clear that anyone, noncreationist or creationist, has actually verified whether old trees of
It was concluded that the crossmatches appear to be substantially sound, albeit with some ‘play’ in the data. It was also suggested that multiple rings per year, while occurring in young trees and remaining a possibility for older ones, are not consistent with the known growth
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habits of the BCP (Woodmorappe 2003b, p.120).
Whereas the assumption that a species’ genetics should largely control the physiology of its growth rings is probably valid, apparently the necessary research to verify this for BCP has not been done. Woodmorappe in his ICC paper (2003a) was able to locate only a single physiological study, which was by the University of Arizona (Woodmorappe’s reference 13), that appeared to support lack of multiple rings in BCP. However, Woodmorappe did not detail the techniques used in that study. Therefore it appears that Woodmorappe’s confidence in strictly annual rings appears to be based primarily on the high statistical probability of accurate
I am intrigued by the fact that the BCP trees downslope from the
3.Development of accurate models of
The excellent experimental work of Aardsma is a model for future creationist research on radiocarbon dating. However, it needs to be repeated using a wide range of assumptions, including multiple versions of variation in the
When dendrochronologies are made to correspond precisely with real years, the
4.Geologic placement of the
There are two goals that this meets. First, the boundary needs fixing in order to estimate the amount of geologic activity that has
occurred since the Flood. That is, if the Flood ended at the K/ Pg boundary, then a great deal of tectonic and sedimentary action occurred between the Flood and the time the first
5.Complete understanding of
A review of the literature is needed to establish whether carbon assimilation is only from the air or can be from conversion of carbonate in the sap. Likewise, does contamination from
6.Biogeographic history of the tree species used for dendrochronology calibration curves
Too often in creationist writings, the dendrochronological ages of living trees are accepted at face value and, based on the biblical chronology followed, the writer assumes that the particular tree must have been growing within a few years after the Flood. Without the geologic and climatic context of the
For example, Bailey (1970) and Meyer (2012) cited BCP fossils suggesting that the immediate ancestor of the three modern species of BCP existed in the Cretaceous or Paleocene in Alaska. High elevation fossils from the lowermost Oligocene of New Mexico and Upper Oligocene in Utah and Colorado suggest that high elevation slopes and subalpine forest had developed in what is now the Rocky Mountains and Great Basin at that time. The BCP in the White Mountains is the Great Basin BCP, Pinus longaeva, and is thought to have differentiated on arid mountaintops in the Pliocene/Pleistocene following the formation of the Cascade rainshadow and then spread throughout the Great Basin during the Pleistocene glaciation when vegetation zones were forced to lower elevations. From a creationist perspective (K/Pg Flood boundary), this indicates that the lineage that would differentiate into three species of BCP probably existed before the Flood (perhaps as a monobaramin within a larger pine holobaramin) and the Great Basin BCP could have differentiated as early as the Oligocene or Miocene, but more likely in the Pliocene.
When considering dendrochronology, especially that of the BCP, from a creationist perspective, one must recognize that neither the trees themselves nor the conditions suitable for the growth of these trees existed at the particular locality for many years after the Flood, certainly for decades, if not several centuries. Therefore to develop calibration curves and dating conversions, one must know the geological and biological constraints on when the
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surveys of the literature on fossil material and ecology in geologic and biogeographic contexts of all the species used for calibration of
CONCLUSION
Creation scientists have rightly given attention to understanding and questioning dating of
ACKNOWLEDGMENTS
Dr. Todd Wood suggested I make this study and provided encouragement. The Core Academy of Science provided extensive library resources.
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THE AUTHOR
Roger W. Sanders earned a Ph.D. in systematic botany at the University of Texas at Austin in 1979. After working for nearly 30 years as a theistic evolutionist with public and private research organizations, he adopted the