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Originally published in Journal of Creation 16(1):103-110, April 2002
Taken together, the features of the Columbia River basalts suggest that they were mostly extruded and emplaced during the Late Abative Phase of the Recessive Stage of the Flood.
During the summer of 2001, the authors conducted a field trip to the extreme north-west part of continental USA (Figure 1). We covered parts of the states of Washington (WA) and Oregon (OR) and were episodically joined by creationist geologist Dennis Bukovoy, as well as John Hergenrather and Steven Sparkowich. The rectangular area studied extended approximately 300 km east to west, and 150 km north to south (bound by 45o30' N to 47o30' N and 117o30' W to 120o00' W). Observations of the Channeled Scabland, left over from the Lake Missoula glacial flood, were a highlight of the trip. In addition, some 50 outcrops of Columbia River basalt were observed or examined closely, and these are the subject of this report.
The Columbia River Basalt Group (CRBG) is one of about a dozen very large continental flood basalts of various geological ages that exist on planet Earth. The CRBG covers an area of 163,700 km2 with a volume of about 174,000 km3 in eastern Washington, northern Oregon, and portions of western Idaho (Figure 1).1 The group is composed of about 300 flows, some with volumes as high as 2,000 km3. A few of the flows advanced up to 750 km.2 Each flow has:
‘… similar structural characteristics: a) 2–3 tier columnar jointing; b) nearly planar upper and lower surfaces; c) few surface features suggestive of pahoehoe or aa flows; d) uniform thicknesses for many miles; e) few if any flow units or lava tubes.’3
In terms of uniformitarian geology, the Columbia River basalts are believed to span the Miocene Epoch, having been extruded at intervals from about 17 million years ago to 6 million years ago on the uniformitarian timescale.4 These thick and widespread extrusives are divided into a number of time-stratigraphic units.5
Were these lava flows emplaced gradually over many millions of years? Not likely. To begin with, textural evidence, reported by others, indicates that the lava flows responsible for the Columbia River basalts have traveled some 750 km without significant changes in temperature,6 and this implies ‘extraordinarily rapid emplacement.’ At this speed, the torrents of advancing lava flows must have overwhelmed and entrapped much of the surface material that lay before them on the earth. We observed several instances where material was overlain by the lava flows. Figure 2 shows one such case where a large mass of fossil wood, shaped like a lens, was entrapped beneath a lava flow. Even the textural features of the wood are evident.
At another location, Ginkgo Petrified Forest State Park at Vantage, WA, we observed many petrified logs. However, the term ‘petrified forest’ is misleading because none of the trees appeared to stand in place as if in a forest. Many were tilted at an angle to the horizontal. It is interesting that over 200 species of petrified trees have been identified in Ginkgo Petrified Forest State Park and these represent a large climatic range, from cool temperate (spruce and birch) to subtropical (Eucalyptus and bald cypress).7 The petrified logs have been stripped of limbs and bark8 and are found in a basal pillow complex of the Ginkgo Flow, implying that water preserved the logs from the heat of the lava.9
Scientists researching the CRBG have often commented on the rapidity of eruption. For instance, Reidel and Tolan state:
‘The important conclusion is that these eruptions were orders of magnitude larger than have ever been observed.’10
This clearly precludes any actualistic analogies with extant volcanic processes! It is further observed that two or three basalt flows seem to mix, suggesting that some flows did not even have enough time to solidify before the successive flow occurred.10,11 There is also evidence that basalt flowed onto wet sediments, with incorporation within the lava. All things considered, the uniformitarians are baffled:
‘Little is known about the processes that produced these flood-basalt flows.’12
The rapid emplacement of basalt in flows up to 750 km in length is especially enigmatic to conventional geologists.13,14 Even the very high melting rates needed to mobilize the lava are a challenge to the uniformitarian mindset.15
Naturally, if there is any indication at all of slow flow, some uniformitarian geologists are bound to highlight it. A number of geologists have done just this, providing an apparent mechanism for slower flow.16 The main evidence is pahoehoe or ropy lava texture at the top of some flows. Stephen Reidel, who researched the CRBG for 25 years, does not accept these arguments (although we believe he would like to, because rapid emplacement poses a major problem for the uniformitarian viewpoint). In any case, the apparent evidence for pahoehoe lava is largely restricted to the periphery of the flows, where the rate of advance would have slowed considerably.17,18 This is also the area where pillow palagonite19 complexes and most interbeds are observed.
Entablatures and colonnades are common structural features of basalt. They are named by analogy to the respective horizontal and vertical architectural structures prevalent in classical antiquity.20 Entablatures commonly comprise well over half the thickness of a flow.21 They do not, by themselves, give unambiguous information about the cooling rate of the lavas.22 However, entablatures can solidify and cool very rapidly by water-steam convection.11,20,23 The columnar jointing observed in basalts implies rapid cooling. As described elsewhere,24 water at first only cools the outer ‘skin’ of the lava flow, forming a thin, solid ‘crust.’ The huge temperature gradient between the crust above and the still-hot lava below creates tensional stresses that crack the crust. Water then percolates into the cracks, and the cycle repeats itself. In the end, this rapid, cyclical cooling process produces a thick slab of rock with columnar jointing.
Roughly a quarter of the outcrops we observed showed some degree of columnar jointing. In extreme cases (Figure 3), giant colonnade ‘chimneys’ stand alone in eerie silence, having resisted the erosion which removed the surrounding basalt. In other outcrops, the colonnades resemble organ pipes emplaced within the basalt (Figure 4). Often, there are several horizons of columnar basalt in a large outcrop, interlayered with entablatures. Viewed from a distance, these narrow horizons of colonnades resemble ‘stitchwork’ on the outcrop surface. In other outcrops, the columns are not fully developed, and resemble superficial vertical ‘slices’ within the basalt.
Were the Columbia River basalts extruded under Floodwater or onto dry land, perhaps after the Flood? One obvious indicator of subaqueous extrusion is pillow lava and palagonite (Figure 5). These features are found mostly near the periphery of the lava flows, where one would expect the flows to slow down enough to form pillows. Waters writes:
‘Pillow lava-palagonite complexes are widespread along the margins of the Columbia River basalt … . Such foreset bedded breccias and associated pillow lava complexes are found at hundreds of localities along the margins of the Columbia River basalt … .’25
We observed that at least a few pillow lavas occur in one out of ten or fifteen outcrops. The actual frequency of pillow lavas, however, is probably significantly greater than this estimate, for at least two reasons. To begin with, most pillows are small, and most outcrops we observed were from a fair distance. Second, most pillow lavas occur at the base of individual flows. These would not be readily seen unless there is some local erosion immediately under the pillow-containing flow, and the observer happens to be situated at the appropriate angle to see the underside of the lava flow. For instance, note that in Figure 2 the small pillows resemble ‘elephants toes,’ and can only be seen because there is a slight gap between them and the underlying fossil-wood layer. One would have to lie on the ground to get a reasonable view of the pillow lavas.
In most outcrops, pillow structures cover only a few square meters of the outcrop. However, there are a few outcrops where tens of metres of vertical outcrop and hundreds of meters of horizontal outcrop consist entirely of interfingered pillow structures. The entire bottom half of Figure 4 shows an example of this. In other locations, pillow structures are prominent in all three dimensions (Figure 5). In the figure, the sand-like material surrounding the pen is palagonite, a greenish-yellow reaction product of hot lava and water. The arrowed layering immediately underneath the pillow structure is a series of rapidly-cooled contact layers between the lava and water.
Although pillow lavas clearly indicate underwater deposition, it cannot be overemphasized that lavas can be extruded subaqeously without producing pillow structures.26 The potential to form pillow lava decreases as the volume of extruded lava increases. The volume of lava increases as the third power but surface area only as the second power. Thus, the effective contact area between lava and water (where pillow lavas can potentially form) becomes proportionately smaller as the volume of lava extruded becomes larger. So also, for similar reasons, the probability becomes smaller that a subsequently-formed erosional surface (outcrop) will happen to expose pillow structures.
There are a variety of additional evidences, which indicate that most, if not all, of the Columbia River basalts were extruded underwater. These include marine fossils (such as sponge spicules, diatoms, and dinoflagellates) between lava flows, and numerous areas of well-rounded, exotic quartzite gravel, cobbles, and boulders locally interbedded with the flows (but mostly lying above the basalt).27–29 The quartzite clasts, some of which lie 1,000 m ASL (above sea level) upon lava anticlines and 2,500 m ASL on ridges of the Wallowa Mountains, north-east Oregon,30 indicate high-energy transport over long distances. The indicators of much subsequent erosion, such as smoothly eroded lava anticlines in the Yakima fold belt, and water gaps, are also consistent with a submarine origin for the basalt flows.29,31 Considering all these evidences, we conclude that the Columbia River basalts were deposited during the Flood, not after the Flood.
We address the question of whether there were appreciable intervals of geologic time between different layers of Columbia River basalt as claimed by uniformitarian geologists. Potentially, supportive evidence would be the presence of extensive valleys or gullies cutting into lava flows, and filled with successive lava flows. Another would be the presence of thick beds of basalt boulders between successive layers of basalt. It is almost astonishing to report that both are conspicuously lacking. To the contrary, in most locations, interbeds between lava flows are essentially nonexistent, and, when they do occur, they are thin, uniform in their thinness, and found mainly at the periphery of the flows. The lava flows themselves consist of monotonously thick layers. Nowhere did we observe anything resembling a valley, or boulder bed, between successive lava flows.
What about those superposed lava flows, which, according to isotopic dating, are anywhere from hundreds of thousands to several millions of years apart in time? One such location is shown in Figure 6.
The top two layers are assigned to the Pomona Member of the Saddle Mountain Basalt. The lowest layer (just above the road) is the Grande Ronde Basalt. The in-between Wanapum Basalt, and the few millions of years it supposedly represents, is absent and there is no undulating erosional surface to mark this supposed ‘missing’ time. James Anderson, referring to the flows in the Columbia River Gorge, concludes:
‘The apparent absence of significant erosion between eruptions suggests little or no coeval deformation.’32
Is this example from the Columbia River basalt unusual? No! It is common for ‘ghost’ uniformitarian time intervals, and much greater ones than those discussed above, to be inserted into vertically (and also horizontally33) contiguous lava flows. For example, the Plio-Pliestocene Rampart beds of California (USA) yielded isotopic dates ranging from 1.4 Ma to 2.56 Ma, but this range of dates is admittedly difficult to accept because of the absence of deep erosion or soil horizons between superjacent lava flows.34 As another example, the Lincoln Porphyry of Colorado (USA), was originally mapped as a single unit because of the geographic proximity of the outcrops and the mineralogical and chemical similarity of the igneous body throughout its extent. It is therefore incongruous to find that parts of the Lincoln Porphyry are 29 million years apart in time, according to isotopic dating.35 As a final example, consider the Garrawilla Lavas of New South Wales, Australia. These are bracketed between Upper Triassic and Jurassic sedimentary rock. Yet these lavas, over a large horizontal scale, grade imperceptibly into lavas which overlie Lower Tertiary sedimentary rock. Consequently, the latter lavas are considered younger, on an ad hoc basis.36 Otherwise, geologists would have to acknowledge that there is actually only one set of lava flows, and that everything between Jurassic and Early Tertiary is contemporaneous!
Although we could not locate convincing field evidence for long periods of time, we realized we needed to be cautious. We did not want to be guilty of selecting evidence that supports a young-earth position and overlooking contrary evidence. For this reason, we asked local creationist geologists, very familiar with the geology of the area, to show us any apparent field evidence for ancient soils. On an earlier field trip, Harold Coffin had shown Mike Oard the location shown in Figure 7. During the present field trip, Dennis Bukovoy called our attention to the area shown in Figure 8.
First of all, it is interesting that these supposed laterites become an extreme type of laterite called bauxite near the west coast of Washington and Oregon.37 Based on present-day occurrences, bauxites are interpreted to form in a hot, wet equatorial climate. However, this does not square with the much-cooler paleoclimate in Washington and Oregon during the Miocene,38 also inferred from standard uniformitarian thinking. It is more reasonable that bauxites, as well as laterites, formed by processes not observed today, most likely during the Flood.
Black and white photography does not do justice to these ‘weathered’ surfaces. Consider Figure 7. In color, the overlying basalt is the usual gray-black, but the underlying ‘laterite’ layer, occurring below the grass-covered basalt layer, is a bright, fire-truck red. When broken by the hammer, the allegedly-weathered basalt displays a somewhat-friable, dull pink-orange texture. The vertical grass-free zone near the hammer (contact zone) represents the unsuccessful attempt by Woodmorappe to excavate enough talus to show the exact point of contact and reveal whether or not a conglomerate is present. Consequently, for now, the only evidence suggestive of long periods of time is the altered state of the subjacent basalt layer.
Even more visually impressive is Figure 8. The ‘soil’ is reddish-pink and crumbles into a powder when handled. Under magnification, some small quartz and feldspar crystals can be seen. The remainder of the material is too fine to be identified in hand sample and has been sent to a lab for analysis. We suggest that the material is a palagonite-like product of a reaction between hot lava and water, not fossil-soil material. In other words, it is likely a product of hydrothermal reactions.39
What are we to make of these alleged indicators of long periods of time between basalt flows? Pending a detailed investigation of the composition of these ‘laterite’ and ‘soil’ features, and an understanding of all of the processes that can lead to their origin, we must put them in perspective. In spite of their visual prominence, even at a distance, which makes them difficult to miss, they are the only such features that we have seen, out of some 50 outcrops visited on this field trip, and then only because we were deliberately led to them. By any standard, they are very uncommon. It stands to reason that, if long intervals of time had elapsed between the supposedly-episodic lava flows, weathered horizons, and fossil soils should be common. At least one such ‘soil’ should occur in every tall (tens of meters high) outcrop. To the contrary they are rare and were most probably caused by localized processes as the basalts extruded.
We will now attempt to place the CRBG within the Flood model of Walker.40 Much evidence indicates that the CRBG was extruded from remarkably consistent N to NNW feeder dikes in south-east Washington, north-east Oregon, and adjacent Idaho during the orogeny that produced the Cascade Mountains of Washington and Oregon, the Idaho batholith of western Idaho,41 and the Blue Mountains of Oregon.42 These fissures are parallel to the uplifted mountains and we suggest that they are tension cracks caused by vertical tectonics. Carlson agrees that the CRBG was extruded during extension:
‘Columbia River volcanism is part of the region-wide volcanism accompanying extension in the northern Basin and Range Province … .’43
Thick gravel deposits are frequently found between flows of the Columbia River basalts (Figure 9). Most of the gravel is comprised of rounded basalt clasts, but the deposits also contain large exotic quartzite clasts from the Rockies. The basalt flows and gravel deposits were lifted to high altitudes by continuing upward tectonics. This is believed to explain the occurrence of quartzite gravel on top of the Wallowa Mountains of northeast Oregon. Some quartzite boulders in central Oregon are several mountain ranges west of their assumed source in the Rocky Mountains. We place this vertical tectonics mostly within the Abative Phase (sheet flow) of the Recessive Stage of the Flood in Walker’s39 model (see Oard44). A Late Abative Phase for the emplacement of practically all the CRBG is consistent with the exotic gravel boulders and the fact that the basalt flows are practically all sheet flows.
It was after the vast majority of the lava was emplaced that the deep canyons were cut, but this would have been mostly during the Dispersive Phase (channelized flow) of the Recessive Stage. For example, the Snake River dissects the basalt flows to a depth of up to 600 m. Intracanyon lava flows can be found in this valley, together with deposits of quartzite gravel (Figure 10). These intracanyon flows are quite patchy, indicating that after the canyon was cut through the basalt sheets, smaller volumes of basalt flowed into the canyons, locally trapping the gravel. These intracanyon flows make up a very small amount of the total volume of the CRBG and would be from the Dispersive Phase. It is possible that that these intracanyon flows could represent basalt that extruded from the middle of the various voluminous sheets of lava before it had time to completely solidify. In other words, the deep canyon was cut so quickly during the Dispersive Phase that the middle of the basalt flows had not yet consolidated. Additional research may help to demonstrate the speed of deposition and erosion of the CRBG.
It is not likely that the intracanyon lava flows continued into the immediate post-Flood period. Too much erosion is evident for it to have occurred under ‘normal’ geologic conditions. The extent of erosion is illustrated in Figure 9, which shows a thick erosional remnant of an intracanyon flow on top of a thick gravel deposit containing quartzite boulders near Lower Monument Dam.
Field studies of the Columbia River basalts reveal a variety of evidences that point to rapid extrusion, rapid cooling, and rapid succession of lava flows. Field evidences also indicate that the lavas were extruded under water.
Some features that have been claimed to indicate long periods of time between basalt flows, such as ‘weathered horizons’ and ‘fossil soils,’ are very rare. This suggests that these features did not develop over long periods of time but would be better explained by nontemporal processes.
The evidence is consistent with the Columbia River basalts being extruded en masse during the global Flood recorded in the Bible. In fact, the field relationships and landforms suggest that the majority of the Columbia River basalts were emplaced during the Late Abative Phase of the Recessive Stage of the Flood.
This, and earlier, studies should be extended to other larger basalt flows found on planet Earth such as Karoo of South Africa, Deccan Traps of India, Parana Basalts of Brazil, and the Siberian basalts. Attention should be focused on indicators of rapid vs. prolonged extrusion and on interpreting the flows within a biblical flood model.